Auto assign PR author (#490)

* Auto assign author to PR

* Proper checking if no one is assigned?

.github/workflows/auto-author-assign.yml

@@ -0,0 +1,16 @@
+# .github/workflows/auto-author-assign.yml
+name: Auto Author Assign
+
+on:
+  pull_request_target:
+    types: [opened, reopened]
+
+permissions:
+  pull-requests: write
+
+jobs:
+  assign-author:
+    if: ${{ !contains(github.event.pull_request.assignees, '') }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: toshimaru/[email protected]