forkしたリポジトリからのPRではCI Destroy preview environment が動作しないようにする (#9559)

.github/workflows/pr-preview-destroy.yml

@@ -9,6 +9,7 @@ name: Destroy preview environment
 jobs:
   destroy-preview-environment:
     runs-on: ubuntu-latest
+    if: github.repository == github.event.pull_request.head.repo.full_name
     steps:
       - name: Context
         uses: okteto/context@latest