ci: Skip treeshaking in fork PRs (#2289)

Author: aleksanderkatan

.github/workflows/treeshake-test.yml

@@ -11,6 +11,7 @@ on:
 
 jobs:
   treeshake-test:
+    if: github.event.pull_request.head.repo.full_name == github.repository
     permissions:
       contents: read
       issues: write