Add a workflow to lint github actions

.github/workflows/lint-actions.yml

@@ -0,0 +1,29 @@
+name: Lint workflow files
+
+on:
+  merge_group:
+  pull_request:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{github.workflow}}-${{github.ref}}
+  cancel-in-progress: ${{github.event_name == 'pull_request'}}
+
+jobs:
+  lint-github-actions:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+      - name: Download actionlint
+        id: get_actionlint
+        run: |
+          curl -o actionlint-matcher.json https://raw.githubusercontent.com/rhysd/actionlint/main/.github/actionlint-matcher.json
+          echo "::add-matcher::actionlint-matcher.json"
+          bash <(curl https://raw.githubusercontent.com/rhysd/actionlint/main/scripts/download-actionlint.bash)
+        shell: bash
+      - name: Check workflow files
+        run: ${{ steps.get_actionlint.outputs.executable }} -color
+        shell: bash