Add CI job checking for bad PR labels (JuliaTesting#211)

.github/workflows/enforce-labels.yml

@@ -0,0 +1,19 @@
+name: Enforce PR labels
+
+permissions:
+  contents: read
+on:
+  pull_request:
+    types: [labeled, unlabeled, opened, reopened, edited, synchronize]
+jobs:
+  enforce-labels:
+    name: Check for blocking labels
+    runs-on: ubuntu-latest
+    timeout-minutes: 2
+    steps:
+    - uses: yogevbd/[email protected]
+      with:
+        # REQUIRED_LABELS_ANY: "bug,enhancement,skip-changelog"
+        # REQUIRED_LABELS_ANY_DESCRIPTION: "Select at least one label ['bug','enhancement','skip-changelog']"
+        BANNED_LABELS: "needs changelog,DO NOT MERGE"
+        BANNED_LABELS_DESCRIPTION: "A PR should not be merged with `needs *` or `DO NOT MERGE` labels"