update auto assign workflow (#28387)

* update auto assign workflow

* update rest call and workflow name

* move permission block

.github/workflows/auto-assign-reviewers-to-pr.yaml

@@ -1,25 +1,30 @@
-name: Auto Assign Reviewers as Assignees
+name: Assign Reviewer as Assignee
 
 on:
-  pull_request:
+  pull_request_review:
     types:
-      - review_requested
-      - review_request_removed
-      - reopened
-      - edited
-      - synchronize
+      - submitted
 
 jobs:
-  auto_assign_reviewers:
+  assign_reviewer:
     runs-on: ubuntu-latest
-
+    permissions:
+      issues: write
+      pull-requests: write
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v3
-
-      - name: Get reviewers and assign them
-        uses: peter-evans/review-assign-action@v1
+      - name: Assign the reviewer as assignee
+        uses: actions/github-script@v6
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          reviewers: reviewers
-          assignees: reviewers
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const reviewer = context.payload.review.user.login;
+            const prNumber = context.payload.pull_request.number;
+
+            console.log(`Assigning reviewer: ${reviewer} to PR #${prNumber}`);
+
+            await github.rest.issues.addAssignees({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: prNumber,
+              assignees: [reviewer],
+            });