ci: lint commit messages

Use `@commitlint/config-conventional` to lint commit messages to conform
to the angluar commit message format. This will allow us to generate the
changelog automatically in the future.

.github/workflows/run-ci.yml

@@ -2,6 +2,25 @@ name: CI
 run-name: Check ${{ github.ref_name }} by @${{ github.actor }}
 on: pull_request
 jobs:
+  commit-message:
+    name: Check commit message format
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20.x'
+      - name: Install commitlint
+        run: |
+          npm install @commitlint/config-conventional @commitlint/cli
+          echo "export default {extends: ['@commitlint/config-conventional']};" > commitlint.config.js
+      - name: Lint commit messages
+        run: npx commitlint --from=$(git rev-parse origin/${{ github.base_ref}}) --to=HEAD
+
   linters:
     name: Run linters
     runs-on: ubuntu-latest