Disable "validate pull request" workflow for release pull requests

Author: Mrtenz

.github/workflows/validate-pull-request.yml

@@ -13,6 +13,7 @@ jobs:
   validate-pull-request-title:
     name: Validate title
     runs-on: ubuntu-latest
+    if: !startsWith(github.head_ref , 'release/')
     steps:
       - name: Validate title
         # `amannn/[email protected]`