ci: add commitlint to the workflow for better code consistency

- Add commitlint to the workflow
- Create commitlint.config.js file

Author: appleboy

.github/workflows/testing.yml

@@ -37,3 +37,11 @@ jobs:
 
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v3
+
+  commitlint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - uses: wagoid/commitlint-github-action@v5

commitlint.config.js

@@ -0,0 +1 @@
+module.exports = {extends: ['@commitlint/config-conventional']}