impr(PR labels): automatically label PRs "waiting for review/update" (@sanidhyas3s) (#5830)

!nuf

.github/workflows/label-pr.yml

@@ -0,0 +1,58 @@
+name: Update PR labels
+
+permissions:
+  contents: read
+  pull-requests: write
+
+on:
+  pull_request:
+    types: [review_requested, review_request_removed]
+  pull_request_review: 
+    types: [submitted]
+  issue_comment:
+    types: [created]
+
+jobs:
+  update-pr-labels:
+    name: Update PR Labels Based on Events
+    runs-on: ubuntu-latest
+    steps:
+      - name: Remove "waiting for update" label if comment is by PR author or a review is requested
+        if: ${{ (github.event.issue.pull_request && github.event_name == 'issue_comment' && github.event.comment.user.login == github.event.issue.user.login) || (github.event.action == 'review_requested') }}
+        uses: actions-ecosystem/action-remove-labels@v1
+        with:
+          labels: waiting for update
+        env:
+          NUMBER: ${{ github.event.issue.number }}
+
+      - name: Add "waiting for review" if a review is requested
+        if: github.event.action == 'review_requested'
+        uses: actions-ecosystem/action-add-labels@v1
+        with:
+          labels: waiting for review
+        env:
+          NUMBER: ${{ github.event.pull_request.number }}
+
+      - name: Remove "waiting for review" label if review request is removed
+        if: github.event.action == 'review_request_removed'
+        uses: actions-ecosystem/action-remove-labels@v1
+        with:
+          labels: waiting for review
+        env:
+          NUMBER: ${{ github.event.issue.number }}
+
+      - name: Add "waiting for update" if changes are requested
+        if: ${{(github.event_name == 'pull_request_review' && github.event.review.state == 'changes_requested')}}
+        uses: actions-ecosystem/action-add-labels@v1
+        with:
+          labels: waiting for update
+        env:
+          NUMBER: ${{ github.event.pull_request.number }}
+
+      - name: Remove "waiting for review" label after review
+        if: ${{github.event_name == 'pull_request_review' }}
+        uses: actions-ecosystem/action-remove-labels@v1
+        with:
+          labels: waiting for review
+        env:
+          NUMBER: ${{ github.event.issue.number }}