chore: automate marking as draft on requesting changes (#6729)

.github/workflows/mark-as-draft-on-requesting-changes.yml

@@ -0,0 +1,60 @@
+name: Mark PR as draft when changes are requested
+
+on:
+  pull_request_review:
+    types: [submitted]
+
+  pull_request:
+    types: [labeled]
+
+permissions: {}
+
+jobs:
+  mark-draft:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: read
+    if: |
+      (
+        github.event_name == 'pull_request_review' &&
+        github.event.review.state == 'changes_requested'
+      ) || (
+        github.event_name == 'pull_request' &&
+        github.event.label.name == 'pr:please address review comments'
+      )
+    steps:
+      - name: Add label on requested changes
+        if: github.event_name == 'pull_request_review'
+        env:
+          GH_TOKEN: ${{ github.token }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          REPO: ${{ github.repository }}
+        run: |
+          gh issue edit "$PR_NUMBER" \
+            --repo "$REPO" \
+            --add-label "pr:please address review comments"
+
+      - name: Mark PR as draft
+        env:
+          GH_TOKEN: ${{ github.token }}
+          PR_URL: ${{ github.event.pull_request.html_url }}
+        run: gh pr ready "$PR_URL" --undo || true
+  ready-for-review:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request' && github.event.action == 'ready_for_review'
+
+    steps:
+      - name: Update labels for review
+        env:
+          GH_TOKEN: ${{ github.token }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          REPO: ${{ github.repository }}
+        run: |
+          gh issue edit "$PR_NUMBER" \
+            --repo "$REPO" \
+            --remove-label "pr:please address review comments" || true
+
+          gh issue edit "$PR_NUMBER" \
+            --repo "$REPO" \
+            --add-label "pr:needs review"