ci: add conventional commit pr title enforcement (#413)

Author: DennisOSRM

.github/workflows/ci.yml

@@ -14,6 +14,23 @@ permissions:
   contents: read
 
 jobs:
+  conventional-pr-title:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Validate pull request title
+        env:
+          PR_TITLE: ${{ github.event.pull_request.title }}
+        run: |
+          pattern='^(build|chore|ci|docs|feat|fix|perf|refactor|revert|style|test)(\([[:alnum:]_.-]+\))?(!)?: .+$'
+
+          if [[ ! "$PR_TITLE" =~ $pattern ]]; then
+            echo "PR title must follow Conventional Commits, for example: feat(ui): add route summary"
+            echo "Got: $PR_TITLE"
+            exit 1
+          fi
+
   lint-and-test:
     runs-on: ubuntu-latest