ci: automation for deprecation project board (#39477)

.github/workflows/pull-request-labeled.yml

@@ -0,0 +1,33 @@
+name: Pull Request Labeled
+
+on:
+  pull_request:
+    types: [labeled]
+
+permissions:
+  contents: read
+
+jobs:
+  pull-request-labeled-deprecation-review-complete:
+    name: deprecation-review/complete label added
+    if: github.event.label.name == 'deprecation-review/complete ✅'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Generate GitHub App token
+        id: generate-token
+        env:
+          RELEASE_BOARD_GH_APP_CREDS: ${{ secrets.RELEASE_BOARD_GH_APP_CREDS }}
+        run: |
+          set -eo pipefail
+          TOKEN=$(npx @electron/github-app-auth --creds=$RELEASE_BOARD_GH_APP_CREDS --org electron)
+          echo "TOKEN=$TOKEN" >> "$GITHUB_OUTPUT"
+      - name: Set status
+        if: ${{ steps.generate-token.outputs.TOKEN }}
+        uses: github/update-project-action@2d475e08804f11f4022df7e21f5816531e97cb64 # v2
+        with:
+          github_token: ${{ steps.generate-token.outputs.TOKEN }}
+          organization: electron
+          project_number: 94
+          content_id: ${{ github.event.pull_request.node_id }}
+          field: Status
+          value: ✅ Reviewed