Merge pull request #2 from guardian/add-pr-label-enforcement

Add PR label enforcement

Author: adamnfish-gu

.github/workflows/check-labels.yaml

@@ -0,0 +1,9 @@
+name: CORE4 label enforcement
+permissions:
+  contents: read
+on:
+  pull_request:
+    types: [opened, labeled, unlabeled, synchronize, reopened, edited]
+jobs:
+  require-label:
+    uses: guardian/.github/.github/workflows/require-label.yaml@d8e99387686ec439e37c883ba9bb8ab2b43a6b81 #  v3.0.0