ci: skip pushing on forks

.github/workflows/readme.yml

@@ -12,8 +12,9 @@ env:
   DENO_DIR: deno_cache
 
 jobs:
-  test:
+  readme:
     runs-on: ubuntu-latest
+    name: Re-generate README sections
 
     steps:
       - uses: actions/checkout@v3
@@ -33,6 +34,8 @@ jobs:
         run: ./main.ts
       - name: Push changes
         uses: stefanzweifel/git-auto-commit-action@v4
+        # skip pushing on forks
+        if: ${{ !github.event.pull_request.head.repo.fork }}
         with:
           commit_message: "chore: re-generate README sections"
           branch: ${{ github.head_ref }}