enhance(ci): add PR title validation (#1039)

.github/workflows/validate-pr-title.yml

@@ -0,0 +1,17 @@
+# name of the action
+name: validate PR title
+
+# trigger on pull_request events of the opened & edited type.
+on:
+  pull_request:
+    types: [ opened, synchronize, edited, reopened ]
+
+# pipeline to execute
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: validate title
+      run: |
+        echo "${{ github.event.pull_request.title }}" | grep -Eq '^(feat|fix|chore|refactor|enhance|test|docs)\(.*\):.*$' && (echo "Pass"; exit 0) || (echo "Incorrect Format. Please see https://go-vela.github.io/docs/community/contributing_guidelines/#development-workflow"; exit 1)