From 3a9b16541c8ee12b31514d6d470cb6547ec2a2b3 Mon Sep 17 00:00:00 2001
From: David Dal Busco <david.dalbusco@outlook.com>
Date: Sun, 5 Apr 2026 14:28:36 +0200
Subject: [PATCH 01/12] feat: pre-build Cargo dependencies to speed up
 serverless function compilation

---
 Dockerfile.full      | 25 +++++++++++++++++++++++++
 docker/download/init |  6 +++++-
 kit/deps/Cargo.toml  | 18 ++++++++++++++++++
 kit/deps/src/lib.rs  |  3 +++
 4 files changed, 51 insertions(+), 1 deletion(-)
 create mode 100644 kit/deps/Cargo.toml
 create mode 100644 kit/deps/src/lib.rs

diff --git a/Dockerfile.full b/Dockerfile.full
index f373cb6..d83f6f6 100644
--- a/Dockerfile.full
+++ b/Dockerfile.full
@@ -8,6 +8,7 @@ RUN DEBIAN_FRONTEND=noninteractive apt update && apt install -y \
     bash \
     curl \
     build-essential \
+    jq \
     && rm -rf /var/lib/apt/lists/*
 
 # Create a working user
@@ -44,6 +45,24 @@ COPY --chown=apprunner:apprunner ./kit/setup/bootstrap ./kit/setup/bootstrap
 # Install core tools required for building WASM (same as in the main Juno repository)
 RUN ./kit/setup/bootstrap
 
+# Pre-build all cargo dependencies for Sputnik build
+RUN cd /juno/target/juno-main \
+    && mkdir -p src/satellite/src && touch src/satellite/src/lib.rs \
+    && mkdir -p src/sputnik/src && touch src/sputnik/src/lib.rs \
+    && mkdir -p src/libs/macros/src && touch src/libs/macros/src/lib.rs \
+    && mkdir -p src/libs/satellite/src && touch src/libs/satellite/src/lib.rs \
+    && mkdir -p src/libs/shared/src && touch src/libs/shared/src/lib.rs \
+    && mkdir -p src/libs/utils/src && touch src/libs/utils/src/lib.rs \
+    && mkdir -p src/libs/collections/src && touch src/libs/collections/src/lib.rs \
+    && mkdir -p src/libs/storage/src && touch src/libs/storage/src/lib.rs \
+    && mkdir -p src/libs/cdn/src && touch src/libs/cdn/src/lib.rs \
+    && mkdir -p src/libs/auth/src && touch src/libs/auth/src/lib.rs \
+    && ./docker/build-deps
+
+# Pre-build latest junobuild-* cargo dependencies for Satellites functions build
+COPY --chown=apprunner:apprunner ./kit/deps /home/apprunner/deps
+RUN cd /home/apprunner/deps && cargo build --target wasm32-unknown-unknown --release
+
 # --- Runtime Stage ---
 FROM node:24-slim@sha256:76d0ed0ed93bed4f4376211e9d8fddac4d8b3fbdb54cc45955696001a3c91152
 
@@ -100,6 +119,12 @@ COPY --from=builder --chown=apprunner:apprunner /juno/target/juno-main/Cargo.loc
 COPY --from=builder --chown=apprunner:apprunner /juno/target/juno-main/Cargo.toml /juno/Cargo.toml
 COPY --from=builder --chown=apprunner:apprunner /juno/target/juno-main/rust-toolchain.toml /juno/rust-toolchain.toml
 
+# Copy pre-built Cargo dependencies to avoid recompiling them on each CI run
+# Particularly useful for Sputnik since its version is always the one bundled
+# in the image
+COPY --from=builder --chown=apprunner:apprunner /juno/target/juno-main/target /juno/target
+COPY --from=builder --chown=apprunner:apprunner /home/apprunner/.cargo/registry /home/apprunner/.cargo/registry
+
 # Resolves cargo build error:
 # network failure seems to have happened
 # if a proxy or similar is necessary `net.git-fetch-with-cli` may help here
diff --git a/docker/download/init b/docker/download/init
index 901c878..0b58e02 100755
--- a/docker/download/init
+++ b/docker/download/init
@@ -2,4 +2,8 @@
 
 set -euo pipefail
 
-./docker/download/juno-source
\ No newline at end of file
+./docker/download/juno-source
+
+# Remove [patch.crates-io] section so developer satellite builds resolve
+# their declared junobuild-* versions from crates.io instead of the bundled workspace
+sed -i '/^\[patch\.crates-io\]/,/^$/d' "$JUNO_MAIN_DIR/Cargo.toml"
\ No newline at end of file
diff --git a/kit/deps/Cargo.toml b/kit/deps/Cargo.toml
new file mode 100644
index 0000000..c7eb85c
--- /dev/null
+++ b/kit/deps/Cargo.toml
@@ -0,0 +1,18 @@
+# Dummy crate to pre-build the latest published junobuild-* dependencies into the
+# Cargo target cache, so developers don't have to compile them from scratch on each CI run.
+[package]
+name = "deps"
+version = "0.0.1"
+edition = "2021"
+
+[lib]
+
+[dependencies]
+junobuild-satellite = { version = "*", default-features = false }
+junobuild-macros = "*"
+junobuild-utils = "*"
+junobuild-shared = "*"
+junobuild-collections = "*"
+junobuild-storage = "*"
+junobuild-cdn = "*"
+junobuild-auth = "*"
\ No newline at end of file
diff --git a/kit/deps/src/lib.rs b/kit/deps/src/lib.rs
new file mode 100644
index 0000000..f9aa721
--- /dev/null
+++ b/kit/deps/src/lib.rs
@@ -0,0 +1,3 @@
+use junobuild_macros::include_satellite;
+
+include_satellite!();
\ No newline at end of file

From 68f456b23b72ea46a50bd9278d624a10e41994d6 Mon Sep 17 00:00:00 2001
From: David Dal Busco <david.dalbusco@outlook.com>
Date: Sun, 5 Apr 2026 14:58:26 +0200
Subject: [PATCH 02/12] chore: revert bullshit

---
 docker/download/init | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/docker/download/init b/docker/download/init
index 0b58e02..901c878 100755
--- a/docker/download/init
+++ b/docker/download/init
@@ -2,8 +2,4 @@
 
 set -euo pipefail
 
-./docker/download/juno-source
-
-# Remove [patch.crates-io] section so developer satellite builds resolve
-# their declared junobuild-* versions from crates.io instead of the bundled workspace
-sed -i '/^\[patch\.crates-io\]/,/^$/d' "$JUNO_MAIN_DIR/Cargo.toml"
\ No newline at end of file
+./docker/download/juno-source
\ No newline at end of file

From 80db5a026b34c70af985fb43fb70411da21c2032 Mon Sep 17 00:00:00 2001
From: David Dal Busco <david.dalbusco@outlook.com>
Date: Sun, 5 Apr 2026 15:42:43 +0200
Subject: [PATCH 03/12] feat: pre-build crates to same target

---
 Dockerfile.full | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Dockerfile.full b/Dockerfile.full
index d83f6f6..d4bd29c 100644
--- a/Dockerfile.full
+++ b/Dockerfile.full
@@ -61,7 +61,7 @@ RUN cd /juno/target/juno-main \
 
 # Pre-build latest junobuild-* cargo dependencies for Satellites functions build
 COPY --chown=apprunner:apprunner ./kit/deps /home/apprunner/deps
-RUN cd /home/apprunner/deps && cargo build --target wasm32-unknown-unknown --release
+RUN cd /home/apprunner/deps && cargo build --target wasm32-unknown-unknown --target-dir /juno/target/juno-main/target --release
 
 # --- Runtime Stage ---
 FROM node:24-slim@sha256:76d0ed0ed93bed4f4376211e9d8fddac4d8b3fbdb54cc45955696001a3c91152

From c0f858a098ba9d747789583979f638e0f2ff879e Mon Sep 17 00:00:00 2001
From: David Dal Busco <david.dalbusco@outlook.com>
Date: Sun, 5 Apr 2026 17:48:36 +0200
Subject: [PATCH 04/12] fix: getrandom_backend custom

---
 Dockerfile.full    | 19 +++----------------
 kit/setup/prebuild | 23 +++++++++++++++++++++++
 2 files changed, 26 insertions(+), 16 deletions(-)
 create mode 100755 kit/setup/prebuild

diff --git a/Dockerfile.full b/Dockerfile.full
index d4bd29c..2e5715b 100644
--- a/Dockerfile.full
+++ b/Dockerfile.full
@@ -45,23 +45,10 @@ COPY --chown=apprunner:apprunner ./kit/setup/bootstrap ./kit/setup/bootstrap
 # Install core tools required for building WASM (same as in the main Juno repository)
 RUN ./kit/setup/bootstrap
 
-# Pre-build all cargo dependencies for Sputnik build
-RUN cd /juno/target/juno-main \
-    && mkdir -p src/satellite/src && touch src/satellite/src/lib.rs \
-    && mkdir -p src/sputnik/src && touch src/sputnik/src/lib.rs \
-    && mkdir -p src/libs/macros/src && touch src/libs/macros/src/lib.rs \
-    && mkdir -p src/libs/satellite/src && touch src/libs/satellite/src/lib.rs \
-    && mkdir -p src/libs/shared/src && touch src/libs/shared/src/lib.rs \
-    && mkdir -p src/libs/utils/src && touch src/libs/utils/src/lib.rs \
-    && mkdir -p src/libs/collections/src && touch src/libs/collections/src/lib.rs \
-    && mkdir -p src/libs/storage/src && touch src/libs/storage/src/lib.rs \
-    && mkdir -p src/libs/cdn/src && touch src/libs/cdn/src/lib.rs \
-    && mkdir -p src/libs/auth/src && touch src/libs/auth/src/lib.rs \
-    && ./docker/build-deps
-
-# Pre-build latest junobuild-* cargo dependencies for Satellites functions build
+# Pre-build Cargo dependencies to speed up serverless function compilation when used in the actions
 COPY --chown=apprunner:apprunner ./kit/deps /home/apprunner/deps
-RUN cd /home/apprunner/deps && cargo build --target wasm32-unknown-unknown --target-dir /juno/target/juno-main/target --release
+COPY --chown=apprunner:apprunner ./kit/setup/prebuild ./kit/setup/prebuild
+RUN ./kit/setup/prebuild
 
 # --- Runtime Stage ---
 FROM node:24-slim@sha256:76d0ed0ed93bed4f4376211e9d8fddac4d8b3fbdb54cc45955696001a3c91152
diff --git a/kit/setup/prebuild b/kit/setup/prebuild
new file mode 100755
index 0000000..724a027
--- /dev/null
+++ b/kit/setup/prebuild
@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+# Pre-build all cargo dependencies for Sputnik build
+mkdir -p "$JUNO_MAIN_DIR/src/satellite/src" && touch "$JUNO_MAIN_DIR/src/satellite/src/lib.rs"
+mkdir -p "$JUNO_MAIN_DIR/src/sputnik/src" && touch "$JUNO_MAIN_DIR/src/sputnik/src/lib.rs"
+mkdir -p "$JUNO_MAIN_DIR/src/libs/macros/src" && touch "$JUNO_MAIN_DIR/src/libs/macros/src/lib.rs"
+mkdir -p "$JUNO_MAIN_DIR/src/libs/satellite/src" && touch "$JUNO_MAIN_DIR/src/libs/satellite/src/lib.rs"
+mkdir -p "$JUNO_MAIN_DIR/src/libs/shared/src" && touch "$JUNO_MAIN_DIR/src/libs/shared/src/lib.rs"
+mkdir -p "$JUNO_MAIN_DIR/src/libs/utils/src" && touch "$JUNO_MAIN_DIR/src/libs/utils/src/lib.rs"
+mkdir -p "$JUNO_MAIN_DIR/src/libs/collections/src" && touch "$JUNO_MAIN_DIR/src/libs/collections/src/lib.rs"
+mkdir -p "$JUNO_MAIN_DIR/src/libs/storage/src" && touch "$JUNO_MAIN_DIR/src/libs/storage/src/lib.rs"
+mkdir -p "$JUNO_MAIN_DIR/src/libs/cdn/src" && touch "$JUNO_MAIN_DIR/src/libs/cdn/src/lib.rs"
+mkdir -p "$JUNO_MAIN_DIR/src/libs/auth/src" && touch "$JUNO_MAIN_DIR/src/libs/auth/src/lib.rs"
+"$JUNO_MAIN_DIR/docker/build-deps"
+
+# Pre-build latest junobuild-* cargo dependencies for Satellites functions build
+RUSTFLAGS='--cfg getrandom_backend="custom"' cargo build \
+    --manifest-path /home/apprunner/deps/Cargo.toml \
+    --target wasm32-unknown-unknown \
+    --target-dir "$JUNO_MAIN_DIR/target" \
+    --release
\ No newline at end of file

From 83647dc0ef8a729874418e377c9795c90b364806 Mon Sep 17 00:00:00 2001
From: David Dal Busco <david.dalbusco@outlook.com>
Date: Sun, 5 Apr 2026 17:51:33 +0200
Subject: [PATCH 05/12] fix: path

---
 kit/setup/prebuild | 32 +++++++++++++++-----------------
 1 file changed, 15 insertions(+), 17 deletions(-)

diff --git a/kit/setup/prebuild b/kit/setup/prebuild
index 724a027..a6e7f2a 100755
--- a/kit/setup/prebuild
+++ b/kit/setup/prebuild
@@ -3,21 +3,19 @@
 set -euo pipefail
 
 # Pre-build all cargo dependencies for Sputnik build
-mkdir -p "$JUNO_MAIN_DIR/src/satellite/src" && touch "$JUNO_MAIN_DIR/src/satellite/src/lib.rs"
-mkdir -p "$JUNO_MAIN_DIR/src/sputnik/src" && touch "$JUNO_MAIN_DIR/src/sputnik/src/lib.rs"
-mkdir -p "$JUNO_MAIN_DIR/src/libs/macros/src" && touch "$JUNO_MAIN_DIR/src/libs/macros/src/lib.rs"
-mkdir -p "$JUNO_MAIN_DIR/src/libs/satellite/src" && touch "$JUNO_MAIN_DIR/src/libs/satellite/src/lib.rs"
-mkdir -p "$JUNO_MAIN_DIR/src/libs/shared/src" && touch "$JUNO_MAIN_DIR/src/libs/shared/src/lib.rs"
-mkdir -p "$JUNO_MAIN_DIR/src/libs/utils/src" && touch "$JUNO_MAIN_DIR/src/libs/utils/src/lib.rs"
-mkdir -p "$JUNO_MAIN_DIR/src/libs/collections/src" && touch "$JUNO_MAIN_DIR/src/libs/collections/src/lib.rs"
-mkdir -p "$JUNO_MAIN_DIR/src/libs/storage/src" && touch "$JUNO_MAIN_DIR/src/libs/storage/src/lib.rs"
-mkdir -p "$JUNO_MAIN_DIR/src/libs/cdn/src" && touch "$JUNO_MAIN_DIR/src/libs/cdn/src/lib.rs"
-mkdir -p "$JUNO_MAIN_DIR/src/libs/auth/src" && touch "$JUNO_MAIN_DIR/src/libs/auth/src/lib.rs"
-"$JUNO_MAIN_DIR/docker/build-deps"
+cd "$JUNO_MAIN_DIR" \
+    && mkdir -p src/satellite/src && touch src/satellite/src/lib.rs \
+    && mkdir -p src/sputnik/src && touch src/sputnik/src/lib.rs \
+    && mkdir -p src/libs/macros/src && touch src/libs/macros/src/lib.rs \
+    && mkdir -p src/libs/satellite/src && touch src/libs/satellite/src/lib.rs \
+    && mkdir -p src/libs/shared/src && touch src/libs/shared/src/lib.rs \
+    && mkdir -p src/libs/utils/src && touch src/libs/utils/src/lib.rs \
+    && mkdir -p src/libs/collections/src && touch src/libs/collections/src/lib.rs \
+    && mkdir -p src/libs/storage/src && touch src/libs/storage/src/lib.rs \
+    && mkdir -p src/libs/cdn/src && touch src/libs/cdn/src/lib.rs \
+    && mkdir -p src/libs/auth/src && touch src/libs/auth/src/lib.rs \
+    && ./docker/build-deps
 
-# Pre-build latest junobuild-* cargo dependencies for Satellites functions build
-RUSTFLAGS='--cfg getrandom_backend="custom"' cargo build \
-    --manifest-path /home/apprunner/deps/Cargo.toml \
-    --target wasm32-unknown-unknown \
-    --target-dir "$JUNO_MAIN_DIR/target" \
-    --release
\ No newline at end of file
+# Pre-build latest published junobuild-* dependencies for satellite builds
+cd /home/apprunner/deps
+RUSTFLAGS='--cfg getrandom_backend="custom"' cargo build --target wasm32-unknown-unknown --target-dir "$JUNO_MAIN_DIR/target" --release
\ No newline at end of file

From 13e77ac39a1ce708b83c46b14e6d69978627499f Mon Sep 17 00:00:00 2001
From: David Dal Busco <david.dalbusco@outlook.com>
Date: Sun, 5 Apr 2026 18:15:51 +0200
Subject: [PATCH 06/12] feat: build only satellite and sputnik

---
 kit/setup/prebuild | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kit/setup/prebuild b/kit/setup/prebuild
index a6e7f2a..993347d 100755
--- a/kit/setup/prebuild
+++ b/kit/setup/prebuild
@@ -14,7 +14,8 @@ cd "$JUNO_MAIN_DIR" \
     && mkdir -p src/libs/storage/src && touch src/libs/storage/src/lib.rs \
     && mkdir -p src/libs/cdn/src && touch src/libs/cdn/src/lib.rs \
     && mkdir -p src/libs/auth/src && touch src/libs/auth/src/lib.rs \
-    && ./docker/build-deps
+    && ./docker/build --only-dependencies --satellite \
+    && ./docker/build --only-dependencies --sputnik
 
 # Pre-build latest published junobuild-* dependencies for satellite builds
 cd /home/apprunner/deps

From 7a737e4b3da9e53ec30eaef0d2d00ec89b87d14c Mon Sep 17 00:00:00 2001
From: David Dal Busco <david.dalbusco@outlook.com>
Date: Sun, 5 Apr 2026 18:17:06 +0200
Subject: [PATCH 07/12] fix: inlcudes

---
 kit/deps/src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kit/deps/src/lib.rs b/kit/deps/src/lib.rs
index f9aa721..6931f19 100644
--- a/kit/deps/src/lib.rs
+++ b/kit/deps/src/lib.rs
@@ -1,3 +1,3 @@
-use junobuild_macros::include_satellite;
+use junobuild_satellite::include_satellite;
 
 include_satellite!();
\ No newline at end of file

From 83b8c1df51e45f53ce7945ceda76c7e52e4bb7c7 Mon Sep 17 00:00:00 2001
From: David Dal Busco <david.dalbusco@outlook.com>
Date: Sun, 5 Apr 2026 18:39:56 +0200
Subject: [PATCH 08/12] fix: pin

---
 kit/deps/Cargo.toml | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/kit/deps/Cargo.toml b/kit/deps/Cargo.toml
index c7eb85c..9b16b9f 100644
--- a/kit/deps/Cargo.toml
+++ b/kit/deps/Cargo.toml
@@ -8,11 +8,15 @@ edition = "2021"
 [lib]
 
 [dependencies]
-junobuild-satellite = { version = "*", default-features = false }
-junobuild-macros = "*"
-junobuild-utils = "*"
-junobuild-shared = "*"
-junobuild-collections = "*"
-junobuild-storage = "*"
-junobuild-cdn = "*"
-junobuild-auth = "*"
\ No newline at end of file
+candid = "0.10.20"
+ic-cdk = "0.19.0"
+ic-cdk-macros = "0.19.0"
+serde = "1.0.225"
+junobuild-satellite = { version = "0.6.0", default-features = false }
+junobuild-macros = "0.4.0"
+junobuild-utils = "0.4.0"
+junobuild-shared = "0.8.0"
+junobuild-collections = "0.5.0"
+junobuild-storage = "0.7.0"
+junobuild-cdn = "0.7.0"
+junobuild-auth = "0.4.0"
\ No newline at end of file

From c0061c5e649c376159e5f86cc29638d8f6624c4b Mon Sep 17 00:00:00 2001
From: David Dal Busco <david.dalbusco@outlook.com>
Date: Mon, 6 Apr 2026 15:40:55 +0200
Subject: [PATCH 09/12] feat: a pity

---
 kit/setup/prebuild | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kit/setup/prebuild b/kit/setup/prebuild
index 993347d..c99509b 100755
--- a/kit/setup/prebuild
+++ b/kit/setup/prebuild
@@ -14,9 +14,11 @@ cd "$JUNO_MAIN_DIR" \
     && mkdir -p src/libs/storage/src && touch src/libs/storage/src/lib.rs \
     && mkdir -p src/libs/cdn/src && touch src/libs/cdn/src/lib.rs \
     && mkdir -p src/libs/auth/src && touch src/libs/auth/src/lib.rs \
-    && ./docker/build --only-dependencies --satellite \
     && ./docker/build --only-dependencies --sputnik
 
-# Pre-build latest published junobuild-* dependencies for satellite builds
+# Pre-download latest published junobuild-* dependencies into the Cargo registry cache.
+# Note: even though we compile them here, the artifacts won't be reused at runtime because
+# Cargo fingerprints are tied to the workspace - the developer's project is a different
+# workspace, so everything will recompile. Only the download step is saved.
 cd /home/apprunner/deps
 RUSTFLAGS='--cfg getrandom_backend="custom"' cargo build --target wasm32-unknown-unknown --target-dir "$JUNO_MAIN_DIR/target" --release
\ No newline at end of file

From e17a03ad86a4b3aad6f4d9ac2910f2d1ad3f89ac Mon Sep 17 00:00:00 2001
From: David Dal Busco <david.dalbusco@outlook.com>
Date: Mon, 6 Apr 2026 16:05:16 +0200
Subject: [PATCH 10/12] docs: todo

---
 kit/setup/prebuild | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kit/setup/prebuild b/kit/setup/prebuild
index c99509b..0f06b10 100755
--- a/kit/setup/prebuild
+++ b/kit/setup/prebuild
@@ -20,5 +20,8 @@ cd "$JUNO_MAIN_DIR" \
 # Note: even though we compile them here, the artifacts won't be reused at runtime because
 # Cargo fingerprints are tied to the workspace - the developer's project is a different
 # workspace, so everything will recompile. Only the download step is saved.
+# TODO: with a third party tool like sscache we might be able to cache the artifacts
+# https://web.mit.edu/rust-lang_v1.25/arch/amd64_ubuntu1404/share/doc/rust/html/cargo/guide/build-cache.html
+# https://github.com/mozilla/sccache
 cd /home/apprunner/deps
 RUSTFLAGS='--cfg getrandom_backend="custom"' cargo build --target wasm32-unknown-unknown --target-dir "$JUNO_MAIN_DIR/target" --release
\ No newline at end of file

From 2056aca7b7c34d60d96b921a578168ac4f206188 Mon Sep 17 00:00:00 2001
From: David Dal Busco <david.dalbusco@outlook.com>
Date: Mon, 6 Apr 2026 16:52:07 +0200
Subject: [PATCH 11/12] feat: try to improve rebuild

---
 Dockerfile.full    | 2 +-
 kit/setup/prebuild | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/Dockerfile.full b/Dockerfile.full
index 2e5715b..765e49f 100644
--- a/Dockerfile.full
+++ b/Dockerfile.full
@@ -109,7 +109,7 @@ COPY --from=builder --chown=apprunner:apprunner /juno/target/juno-main/rust-tool
 # Copy pre-built Cargo dependencies to avoid recompiling them on each CI run
 # Particularly useful for Sputnik since its version is always the one bundled
 # in the image
-COPY --from=builder --chown=apprunner:apprunner /juno/target/juno-main/target /juno/target
+COPY --from=builder --chown=apprunner:apprunner /juno/target /juno/target
 COPY --from=builder --chown=apprunner:apprunner /home/apprunner/.cargo/registry /home/apprunner/.cargo/registry
 
 # Resolves cargo build error:
diff --git a/kit/setup/prebuild b/kit/setup/prebuild
index 0f06b10..92af83e 100755
--- a/kit/setup/prebuild
+++ b/kit/setup/prebuild
@@ -2,6 +2,8 @@
 
 set -euo pipefail
 
+JUNO_TARGET_DIR=/juno/target
+
 # Pre-build all cargo dependencies for Sputnik build
 cd "$JUNO_MAIN_DIR" \
     && mkdir -p src/satellite/src && touch src/satellite/src/lib.rs \
@@ -14,7 +16,7 @@ cd "$JUNO_MAIN_DIR" \
     && mkdir -p src/libs/storage/src && touch src/libs/storage/src/lib.rs \
     && mkdir -p src/libs/cdn/src && touch src/libs/cdn/src/lib.rs \
     && mkdir -p src/libs/auth/src && touch src/libs/auth/src/lib.rs \
-    && ./docker/build --only-dependencies --sputnik
+    && CARGO_TARGET_DIR="$JUNO_TARGET_DIR" ./docker/build --only-dependencies --sputnik
 
 # Pre-download latest published junobuild-* dependencies into the Cargo registry cache.
 # Note: even though we compile them here, the artifacts won't be reused at runtime because
@@ -24,4 +26,4 @@ cd "$JUNO_MAIN_DIR" \
 # https://web.mit.edu/rust-lang_v1.25/arch/amd64_ubuntu1404/share/doc/rust/html/cargo/guide/build-cache.html
 # https://github.com/mozilla/sccache
 cd /home/apprunner/deps
-RUSTFLAGS='--cfg getrandom_backend="custom"' cargo build --target wasm32-unknown-unknown --target-dir "$JUNO_MAIN_DIR/target" --release
\ No newline at end of file
+RUSTFLAGS='--cfg getrandom_backend="custom" -A deprecated' cargo build --target wasm32-unknown-unknown --target-dir "$JUNO_TARGET_DIR" --release
\ No newline at end of file

From 12ed415caca384fb9abaa3873abcfa14db31758c Mon Sep 17 00:00:00 2001
From: David Dal Busco <david.dalbusco@outlook.com>
Date: Mon, 6 Apr 2026 20:05:36 +0200
Subject: [PATCH 12/12] docs: update comment

---
 kit/deps/Cargo.toml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kit/deps/Cargo.toml b/kit/deps/Cargo.toml
index 9b16b9f..55deb81 100644
--- a/kit/deps/Cargo.toml
+++ b/kit/deps/Cargo.toml
@@ -1,5 +1,5 @@
-# Dummy crate to pre-build the latest published junobuild-* dependencies into the
-# Cargo target cache, so developers don't have to compile them from scratch on each CI run.
+# Dummy crate to pre-download and build the latest published junobuild-* dependencies into the
+# Cargo target cache, so developers don't have to download them on each CI run.
 [package]
 name = "deps"
 version = "0.0.1"