Ensure required labels are present

.github/workflows/labels.yml

@@ -0,0 +1,20 @@
+# See https://github.com/jesusvasquez333/verify-pr-label-action
+on:
+  pull_request_target:
+    types: [opened, labeled, unlabeled, synchronize]
+
+jobs:
+  check_pr_labels:
+    runs-on: ubuntu-latest
+    name: Verify that the PR has a valid label
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Verify PR label action
+        uses: jesusvasquez333/[email protected]
+        with:
+          github-token: '${{ secrets.GITHUB_TOKEN }}'
+          valid-labels: 'bug, enhancement, refactoring, major, deprecated, skip-changelog'
+          invalid-labels: 'help wanted, invalid, feedback-needed, incomplete'
+          pull-request-number: '${{ github.event.pull_request.number }}'
+          disable-reviews: true