ci: add commitlint

Author: ken-matsui

.github/workflows/commitlint.yml

@@ -0,0 +1,40 @@
+name: CI
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  commitlint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup node
+        uses: actions/setup-node@v4
+        with:
+          node-version: lts/*
+
+      - name: Install commitlint
+        run: npm install -D @commitlint/cli @commitlint/config-conventional
+
+      - name: Setup commitlint
+        run: echo "export default { extends: ['@commitlint/config-conventional'] };" > commitlint.config.js
+
+      - name: Print versions
+        run: |
+          git --version
+          node --version
+          npm --version
+          npx commitlint --version
+
+      - name: Validate current commit (last commit) with commitlint
+        if: github.event_name == 'push'
+        run: npx commitlint --last --verbose
+
+      - name: Validate PR commits with commitlint
+        if: github.event_name == 'pull_request'
+        run: npx commitlint --from ${{ github.event.pull_request.base.sha }} --to ${{ github.event.pull_request.head.sha }} --verbose