ci: include runner arch in cache keys to prevent restore time conflation

Author: CompeyDev

.github/workflows/ci.yml

@@ -36,19 +36,19 @@ jobs:
         uses: nix-community/cache-nix-action@v6
         id: nix-cache
         with:
-          primary-key: nix-${{ runner.os }}-${{ hashFiles('**/*.nix', '**/flake.lock') }}
-          restore-prefixes-first-match: nix-${{ runner.os }}-
+          primary-key: nix-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('**/*.nix', '**/flake.lock') }}
+          restore-prefixes-first-match: nix-${{ runner.os }}-${{ runner.arch }}-
           gc-max-store-size-linux: 5368709000 
           purge: true
-          purge-prefixes: nix-${{ runner.os }}-
+          purge-prefixes: nix-${{ runner.os }}-${{ runner.arch }}-
           purge-created: 0
           purge-primary-key: never
 
       - name: Restore and cache build data
         uses: actions/cache@v4
         with:
           path: ./target/
-          key: rust-build-${{ runner.os }}-${{ hashFiles('Cargo.toml', 'Cargo.lock', 'rust-toolchain') }} 
+          key: rust-build-${{ runner.os }}-$${{ runner.arch }}-{{ hashFiles('Cargo.toml', 'Cargo.lock', 'rust-toolchain') }} 
 
       - name: Lint rust
         run: nix develop -c bash -c 'mkdir www/build && cargo clippy && cargo deny check --hide-inclusion-graph && cargo fmt --check'
@@ -83,18 +83,18 @@ jobs:
         uses: nix-community/cache-nix-action@v6
         with:
           primary-key: nix-${{ runner.os }}-${{ hashFiles('**/*.nix', '**/flake.lock') }}
-          restore-prefixes-first-match: nix-${{ runner.os }}-
+          restore-prefixes-first-match: nix-${{ runner.os }}-${{ runner.arch }}-
           gc-max-store-size-linux: 5368709000 
           purge: true
-          purge-prefixes: nix-${{ runner.os }}-
+          purge-prefixes: nix-${{ runner.os }}-${{ runner.arch }}-
           purge-created: 0
           purge-primary-key: never
 
       - name: Restore and cache build data
         uses: actions/cache@v4
         with:
           path: ./target/
-          key: rust-build-${{ runner.os }}-${{ hashFiles('Cargo.toml', 'Cargo.lock', 'rust-toolchain') }} 
+          key: rust-build-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('Cargo.toml', 'Cargo.lock', 'rust-toolchain') }} 
 
       - name: Build web
         run: nix develop -c bash -c 'cd www && bun install --locked && bun run build'