update CI workflow to trigger on successful deployment status for 'Preview' environment

Author: py-dev-nandini-12

.github/workflows/panda-webhook.yml

@@ -9,7 +9,7 @@ permissions:
 
 jobs:
   run-e2es:
-    if: github.event_name == 'deployment_status' && github.event.deployment_status.state == 'success'
+    if: github.event_name == 'deployment_status' && github.event.deployment_status.state == 'success' && github.event.deployment_status.environment == 'Preview'
     runs-on: ubuntu-latest
     steps:
       - name: Print environment