Add github action to ensure PRs are labeled.

Author: csyonghe

.github/workflows/ensure-pr-label.yml

@@ -0,0 +1,12 @@
+name: Verify PR Labels
+
+on:
+    pull_request_target:
+     types: [opened, labeled, unlabeled, synchronize]
+
+jobs:
+    steps:
+        uses: jesusvasquez333/verify-pr-label-action@v1.4.0
+        with:
+            valid-labels: 'pr: non-breaking, pr: breaking change, pr: new feature'
+            pull-request-number: '${{ github.event.pull_request.number }}'