chore: update .github/workflows/periodic-reporter.yaml

Author: cloud-foundation-bot

.github/workflows/periodic-reporter.yaml

@@ -1,4 +1,4 @@
-# Copyright 2023 Google LLC
+# Copyright 2023-2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -25,6 +25,8 @@ on:
 
 jobs:
   report:
+    if: github.repository_owner == 'GoogleCloudPlatform' || github.repository_owner == 'terraform-google-modules'
+
     permissions:
       issues: 'write'