Add CI for commitlint (#13)

* ci: add Github actions workflow job for commitlint

Added a Github actions workflow job for linting commit messages on push and PR

Author: WebDevCaptain

.github/workflows/ci.yml

@@ -17,6 +17,34 @@ on:
   workflow_dispatch:
 
 jobs:
+  commitlint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Clone repo
+        uses: actions/checkout@v4
+
+      - name: Install NodeJS
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22.12.0
+
+      - name: Cache npm dependencies
+        uses: actions/cache@v4
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+
+      - name: Install dependencies
+        run: npm ci
+
+      - 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
+
   lint:
     runs-on: ubuntu-latest