chore(ci): disable package cleanup on pull requests

Author: xmatthias

.github/workflows/ci.yml

@@ -593,6 +593,8 @@ jobs:
   packages-cleanup:
     name: "Docker Package Cleanup"
     uses: ./.github/workflows/packages-cleanup.yml
+    # Only run on push, schedule, or release events
+    if: (github.event_name == 'push' || github.event_name == 'schedule') && github.repository == 'freqtrade/freqtrade'
     permissions:
       packages: write
     with: