fix: set default working directory for cleanup job in PR build workflow (#80)

Author: jongio

.github/workflows/pr-build.yml

@@ -389,6 +389,9 @@ jobs:
     if: github.event.action == 'closed' && github.event_name == 'pull_request_target'
     permissions:
       contents: write
+    defaults:
+      run:
+        working-directory: .
 
     steps:
       - name: Delete PR registry release