ci: harden GitHub Actions workflows (zizmor)

.github/workflows/build_docs.yml

@@ -8,11 +8,10 @@ on:
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 
-# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages.
+# Job-specific permissions are granted at the job level below.
 permissions:
   contents: read
-  pages: write
-  id-token: write
 
 # Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
 # However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
@@ -30,7 +29,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # 6.0.2
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+        with:
+          persist-credentials: false
       - name: Setup Node
         uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # 6.4.0
         with:
@@ -44,10 +45,13 @@ jobs:
         run: npm ci
         working-directory: ${{ env.BUILD_PATH }}
       - name: Build with Astro
+        env:
+          PAGES_ORIGIN: ${{ steps.pages.outputs.origin }}
+          PAGES_BASE_PATH: ${{ steps.pages.outputs.base_path }}
         run: |
           npx --no-install astro build \
-            --site "${{ steps.pages.outputs.origin }}" \
-            --base "${{ steps.pages.outputs.base_path }}/"
+            --site "$PAGES_ORIGIN" \
+            --base "$PAGES_BASE_PATH/"
         working-directory: ${{ env.BUILD_PATH }}
       - name: Upload artifact
         uses: actions/upload-pages-artifact@fc324d3547104276b827a68afc52ff2a11cc49c9 # v5.0.0
@@ -61,6 +65,9 @@ jobs:
     needs: build
     runs-on: ubuntu-latest
     name: Deploy
+    permissions:
+      pages: write
+      id-token: write
     steps:
       - name: Deploy to GitHub Pages
         id: deployment

.github/workflows/ci.yml

@@ -27,10 +27,14 @@ jobs:
           - name: macos-aarch64
             os: macos-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # ratchet:actions/checkout@v6.0.2
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+        with:
+          persist-credentials: false
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@631a55b12751854ce901bb631d5902ceb48146f7 # ratchet:dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@e97e2d8cc328f1b50210efc529dca0028893a2d9 # v1
+        with:
+          toolchain: stable
 
       - name: Install Linux build deps
         if: runner.os == 'Linux'
@@ -67,21 +71,27 @@ jobs:
     name: Formatting
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # ratchet:actions/checkout@v6.0.2
-      - uses: dtolnay/rust-toolchain@631a55b12751854ce901bb631d5902ceb48146f7 # ratchet:dtolnay/rust-toolchain@stable
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+        with:
+          persist-credentials: false
+      - uses: dtolnay/rust-toolchain@e97e2d8cc328f1b50210efc529dca0028893a2d9 # v1
         with:
+          toolchain: stable
           components: rustfmt
       - run: cargo fmt --check
 
   clippy:
     name: Clippy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # ratchet:actions/checkout@v6.0.2
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+        with:
+          persist-credentials: false
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@631a55b12751854ce901bb631d5902ceb48146f7 # ratchet:dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@e97e2d8cc328f1b50210efc529dca0028893a2d9 # v1
         with:
+          toolchain: stable
           components: clippy
 
       - name: Install Linux build deps
@@ -98,10 +108,12 @@ jobs:
     name: MSRV check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # ratchet:actions/checkout@v6.0.2
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+        with:
+          persist-credentials: false
 
       - name: Install Rust MSRV toolchain
-        uses: dtolnay/rust-toolchain@631a55b12751854ce901bb631d5902ceb48146f7 # ratchet:dtolnay/rust-toolchain@master
+        uses: dtolnay/rust-toolchain@e97e2d8cc328f1b50210efc529dca0028893a2d9 # v1
         with:
           toolchain: "1.87"
 
@@ -120,7 +132,9 @@ jobs:
     name: Security audit
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # ratchet:actions/checkout@v6.0.2
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+        with:
+          persist-credentials: false
       - name: Install cargo-audit
         run: cargo install cargo-audit
       - name: Run cargo audit