🔧 (close-pr.yaml): add condition to skip workflow for forked repositories

Add a conditional check to ensure the workflow only runs on pull requests from the main repository, not from forks. This prevents unnecessary execution of the workflow on forked repositories, optimizing resource usage and maintaining focus on relevant pull requests.

Author: MrHinsh

.github/workflows/close-pr.yaml

@@ -7,6 +7,7 @@ on:
 jobs:
   pr_cleanup:
     runs-on: ubuntu-latest
+    if: ${{ !(github.event.pull_request.head.repo.fork) }}
     steps:
       - uses: actions/create-github-app-token@v1
         id: app-token