build: add workflow that adds corresponding label when changes are requested

Author: Planeshifter

.github/workflows/labeler_needs_changes.yml

@@ -0,0 +1,62 @@
+#/
+# @license Apache-2.0
+#
+# Copyright (c) 2024 The Stdlib Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#/
+
+# Workflow name:
+name: labeler_needs_changes
+
+# Workflow triggers:
+on:
+  pull_request_review:
+    types: [submitted]
+
+# Workflow jobs:
+jobs:
+
+  # Define a job which automatically labels pull requests as needing changes when a reviewer requests changes:
+  add-needs-changes-label:
+
+    # Define job name:
+    name: 'Add "Needs Changes" Label when Reviewer Requests Changes'
+
+    # Only run this job if the reviewer requested changes:
+    if: ${{ github.event.review.state == 'changes_requested' }}
+
+    # Define job permissions:
+    permissions:
+      contents: read
+      pull-requests: write
+
+    # Define the type of virtual host machine:
+    runs-on: ubuntu-latest
+
+    # Define the sequence of job steps:
+    steps:
+
+      # Add "Needs Changes" label:
+      - name: 'Add "Needs Changes" label'
+        # Pin action to a known commit SHA for reproducibility:
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        with:
+          github-token: ${{ secrets.CHATBOT_GITHUB_TOKEN }}
+          script: |
+            await github.rest.issues.addLabels({
+              'owner': context.repo.owner,
+              'repo': context.repo.repo,
+              'issue_number': context.payload.pull_request.number,
+              'labels': [ 'Needs Changes' ]
+            })