trigger on pull_request once to make sure it's triggered

.github/workflows/tests-e2e.yml

@@ -2,6 +2,8 @@ name: End-to-End Tests
 on:
   issue_comment:
     types: [created]
+  pull_request:
+    branches: [main, 'v[0-9]+.x']
 
 concurrency:
   group: ${{ github.event.issue.number }}