feat: add actionlint

.github/workflows/actionlint.yml

@@ -0,0 +1,85 @@
+name: actionlint
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '.github/workflows/*.ya?ml'
+  pull_request:
+    paths:
+      - '.github/workflows/*.ya?ml'
+
+defaults:
+  run:
+    shell: bash -xeuo pipefail {0}
+
+concurrency:
+  group: "actionlint-${{ github.ref }}"
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+env:
+  HOMEBREW_DEVELOPER: 1
+  HOMEBREW_NO_AUTO_UPDATE: 1
+  HOMEBREW_NO_ENV_HINTS: 1
+
+permissions: {}
+
+# FIXME: The `Install tools` step fails inside the Docker container for some reason.
+jobs:
+  workflow_syntax:
+    if: github.repository_owner == 'Homebrew'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Homebrew
+        id: setup-homebrew
+        uses: Homebrew/actions/setup-homebrew@master
+        with:
+          core: false
+          cask: false
+          test-bot: false
+
+      - name: Install tools
+        run: brew install actionlint shellcheck zizmor
+
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - run: zizmor --format sarif . > results.sarif
+
+      - name: Upload SARIF file
+        uses: actions/upload-artifact@4cec3d8aa04e39d1a68397de0c4cd6fb9dce8ec1 # v4.6.1
+        with:
+          name: results.sarif
+          path: results.sarif
+
+      - name: Set up actionlint
+        run: |
+          # Setting `shell: /bin/bash` prevents shellcheck from running on
+          # those steps, so let's change them to `shell: bash` for linting.
+          sed -i 's|shell: /bin/bash -x|shell: bash -x|' .github/workflows/*.y*ml
+          # The JSON matcher needs to be accessible to the container host.
+          cp "$(brew --repository)/.github/actionlint-matcher.json" "$HOME"
+          echo "::add-matcher::$HOME/actionlint-matcher.json"
+
+      - run: actionlint
+
+  upload_sarif:
+    needs: workflow_syntax
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+    steps:
+      - name: Download SARIF file
+        uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
+        with:
+          name: results.sarif
+          path: results.sarif
+
+      - name: Upload SARIF file
+        uses: github/codeql-action/upload-sarif@b56ba49b26e50535fa1e7f7db0f4f7b4bf65d80d # v3.28.10
+        with:
+          sarif_file: results.sarif
+          category: zizmor