chore: Auto assign PR to author when PR opened (#11890)

- gh action to auto-assign PR to author when PR opened

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

@@ -0,0 +1,28 @@
+name: Auto-assign PR to Author
+
+on:
+  pull_request:
+    types: [opened]
+
+jobs:
+  auto-assign:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Auto-assign PR to author
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const { owner, repo } = context.repo;
+            const pull_number = context.payload.pull_request.number;
+            const author = context.payload.pull_request.user.login;
+            
+            await github.rest.issues.addAssignees({
+              owner,
+              repo,
+              issue_number: pull_number,
+              assignees: [author]
+            });
+            
+            console.log(`Assigned PR #${pull_number} to ${author}`);