ci: update PR title checker (#3713)

Author: bartlomieju

.github/workflows/ci.yml

@@ -15,8 +15,8 @@ jobs:
         env:
           TITLE: ${{ github.event.pull_request.title }}
         run: |
-          if ! echo "$TITLE" | grep -qP '^(feat|fix|test|chore|ci):'; then
-            echo "::error::PR title must start with feat:, fix:, test:, chore:, or ci:"
+          if ! echo "$TITLE" | grep -qP '^(chore|ci|docs|feat|fix|refactor|test):'; then
+            echo "::error::PR title must start with chore:, ci:, docs:, feat:, fix:, refactor: or test:"
             exit 1
           fi