Sync the pre-commit checks with what CI is doing

.github/actions/cache/restore/action.yml

@@ -0,0 +1,30 @@
+name: Restore cache
+description: Restore cache using actions/cache/restore
+inputs:
+  key:
+    description: 'An explicit key for restoring the cache'
+    required: true
+  restore-keys:
+    description: 'An ordered multiline string listing the prefix-matched keys, that are used for restoring stale cache if no cache hit occurred for key. Note `cache-hit` returns false in this case.'
+    required: true
+outputs:
+  cache-primary-key:
+    description: 'A resolved cache key for which cache match was attempted'
+    value: ${{ steps.cache-action-restore.outputs.cache-primary-key }}
+
+runs:
+  using: "composite"
+  steps:
+    - id: cache-action-restore
+      uses: actions/cache/restore@v4.2.3
+      with:
+        key: ${{ inputs.key }}
+        restore-keys: ${{ inputs.restore-keys }}
+        path: |
+          ~/.cache/sccache
+          ~/.cargo/registry
+          ~/.cargo/git
+          ~/.cargo/bin
+          ~/.cargo/.crates.toml
+          ~/.cargo/.crates2.json
+          ~/work/**/target

.github/actions/cache/save/action.yml

@@ -0,0 +1,21 @@
+name: Save cache
+description: Save cache using actions/cache/save
+inputs:
+  key:
+    description: 'An explicit key for saving the cache'
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/cache/save@v4.2.3
+      with:
+        key: ${{ inputs.key }}
+        path: |
+          ~/.cache/sccache
+          ~/.cargo/registry
+          ~/.cargo/git
+          ~/.cargo/bin
+          ~/.cargo/.crates.toml
+          ~/.cargo/.crates2.json
+          ~/work/**/target

.github/actions/pre-commit/dependencies/action.yml

@@ -0,0 +1,23 @@
+name: Install pre-commit dependencies
+description: Install pre-commit dependencies
+
+runs:
+  using: "composite"
+  steps:
+    - name: Install Rust
+      uses: actions-rust-lang/setup-rust-toolchain@v1.13.0
+      with:
+        toolchain: nightly-2025-01-06, stable
+        override: true
+        components: rustfmt, clippy
+        cache: 'false'
+
+    # For more tools, see: https://github.com/taiki-e/install-action/blob/main/TOOLS.md
+    - name: Install Rust tools
+      uses: taiki-e/install-action@v2.57.8
+      with:
+        tool: cargo-binstall,just,cargo-nextest,typos
+
+    - name: Install NPM stuff from helpers/npm-install-g.txt
+      shell: bash
+      run: ./helpers/npm-install-g.sh

.github/workflows/pre-commit_(PR).yml

@@ -0,0 +1,60 @@
+name: Pre-commit hook (PR)
+on:
+  pull_request:
+
+# Fix for OOM.
+env:
+  RUST_CACHE_VERBOSE: true
+  CARGO_BUILD_JOBS: 1
+  CARGO_INCREMENTAL: 0
+  RUSTFLAGS: >
+    -C codegen-units=1
+
+
+jobs:
+  run-pre-commit:
+    name: Run pre-commit hook (PR branch)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get architecture
+        id: get-arch
+        run: echo "ARCH=$(uname -m)" >> $GITHUB_OUTPUT
+
+      - name: Check out repository code
+        uses: actions/checkout@v4
+
+      - name: Compute cache keys
+        id: cache-keys
+        run: |
+          # `main` branch cache keys
+          echo "MAIN_CACHE_KEY=v7-${{ runner.os }}-${{ steps.get-arch.outputs.ARCH }}-main-${{ hashFiles('**/Cargo.lock') }}" >> $GITHUB_OUTPUT
+          echo "MAIN_CACHE_RESTORE_KEY=v7-${{ runner.os }}-${{ steps.get-arch.outputs.ARCH }}-main-" >> $GITHUB_OUTPUT
+          # PR branch cache keys
+          echo "PR_CACHE_KEY=v7-${{ runner.os }}-${{ steps.get-arch.outputs.ARCH }}-PR-${{ hashFiles('**/Cargo.lock') }}" >> $GITHUB_OUTPUT
+          echo "PR_CACHE_RESTORE_KEY=v7-${{ runner.os }}-${{ steps.get-arch.outputs.ARCH }}-PR-" >> $GITHUB_OUTPUT
+
+      # Restoring the PR cache takes into account:
+      #
+      #   1. The PR cache itself, which is used to speed up the PR development cycle.
+      #   2. In case the above is missing, the main branch cache, which is used to bootstrap the PR cache.
+      - name: Restore cache (PR)
+        id: cache-restore
+        uses: ./.github/actions/cache/restore
+        with:
+          key: ${{ steps.cache-keys.outputs.PR_CACHE_KEY }}
+          restore-keys: |
+            ${{ steps.cache-keys.outputs.PR_CACHE_RESTORE_KEY }}
+            ${{ steps.cache-keys.outputs.MAIN_CACHE_RESTORE_KEY }}
+
+      - name: Install pre-commit dependencies
+        uses: ./.github/actions/pre-commit/dependencies
+
+      # Here it is ...
+      - name: Run pre-commit hook
+        run: ./.pre-commit/pre-commit
+
+      - name: Save cache (PR)
+        uses: ./.github/actions/cache/save
+        if: ${{ always() }}
+        with:
+          key: ${{ steps.cache-restore.outputs.cache-primary-key }}

.github/workflows/pre-commit_(main).yml

@@ -0,0 +1,58 @@
+name: Pre-commit hook (main)
+on:
+  push:
+    branches:
+      - main
+
+# Fix for OOM.
+env:
+  RUST_CACHE_VERBOSE: true
+  CARGO_BUILD_JOBS: 1
+  CARGO_INCREMENTAL: 0
+  RUSTFLAGS: >
+    -C codegen-units=1
+
+jobs:
+  run-pre-commit:
+    name: Run pre-commit hook (main branch)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get architecture
+        id: get-arch
+        run: echo "ARCH=$(uname -m)" >> $GITHUB_OUTPUT
+
+      - name: Check out repository code
+        uses: actions/checkout@v4
+
+      - name: Compute cache keys
+        id: cache-keys
+        run: |
+          # `main` branch cache keys
+          echo "MAIN_CACHE_KEY=v7-${{ runner.os }}-${{ steps.get-arch.outputs.ARCH }}-main-${{ hashFiles('**/Cargo.lock') }}" >> $GITHUB_OUTPUT
+          echo "MAIN_CACHE_RESTORE_KEY=v7-${{ runner.os }}-${{ steps.get-arch.outputs.ARCH }}-main-" >> $GITHUB_OUTPUT
+          # PR branch cache keys
+          echo "PR_CACHE_RESTORE_KEY=v7-${{ runner.os }}-${{ steps.get-arch.outputs.ARCH }}-PR-" >> $GITHUB_OUTPUT
+
+      - name: Restore cache (main)
+        id: cache-restore
+        uses: ./.github/actions/cache/restore
+        with:
+          key: ${{ steps.cache-keys.outputs.MAIN_CACHE_KEY }}
+          restore-keys: |
+            ${{ steps.cache-keys.outputs.MAIN_CACHE_RESTORE_KEY }}
+            ${{ steps.cache-keys.outputs.MAIN_CACHE_RESTORE_KEY0 }}
+            ${{ steps.cache-keys.outputs.PR_CACHE_RESTORE_KEY }}
+
+      - name: Install pre-commit dependencies
+        uses: ./.github/actions/pre-commit/dependencies
+
+      # Here it is ...
+      - name: Run pre-commit hook
+        run: ./.pre-commit/pre-commit
+
+
+      - name: Save cache (main)
+        uses: ./.github/actions/cache/save
+        if: ${{ always() }}
+        with:
+          key: ${{ steps.cache-restore.outputs.cache-primary-key }}