ci: Add fork protection to workflow verify-bundled-files (GH-21171)

Author: jorgsowa

.github/workflows/verify-bundled-files.yml

@@ -16,6 +16,7 @@ permissions:
 
 jobs:
   VERIFY_BUNDLED_FILES:
+    if: github.repository == 'php/php-src' || github.event_name == 'workflow_dispatch'
     name: Verify Bundled Files
     runs-on: ubuntu-24.04
     steps: