fix(ci): use intermediate env variable for PR title validator (#377)

* fix(ci): use intermediate env var for PR title

* use server exclaim pattern

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

@@ -13,5 +13,7 @@ jobs:
 
     steps:
     - name: validate title
+      env:
+        TITLE: ${{ github.event.pull_request.title }}
       run: |
-        echo "${{ github.event.pull_request.title }}" | grep -Eq '^(feat|fix|chore|refactor|enhance|test|docs)(\(.*\)|):\s.+$' && (echo "Pass"; exit 0) || (echo "Incorrect Format. Please see https://go-vela.github.io/docs/community/contributing_guidelines/#development-workflow"; exit 1)
+        echo "$TITLE" | grep -Eq '^(feat|fix|chore|refactor|enhance|test|docs)(\(.*\)|)!?:\s.+$' && (echo "Pass"; exit 0) || (echo "Incorrect Format. Please see https://go-vela.github.io/docs/community/contributing_guidelines/#development-workflow"; exit 1)