chore: add validate_workflows.yml

Author: comphead

.github/workflows/validate_workflows.yml

@@ -0,0 +1,24 @@
+name: Validate Workflows
+
+on:
+  pull_request:
+    paths:
+      - ".github/workflows/*.yml"
+      - ".github/workflows/*.yaml"
+  push:
+    branches:
+      - main
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install actionlint
+        run: |
+          curl -sSfL https://raw.githubusercontent.com/rhysd/actionlint/main/scripts/download-actionlint.bash | bash
+          echo "$PWD" >> $GITHUB_PATH
+
+      - name: Lint GitHub Actions workflows
+        run: actionlint -color