Added workflow to label pull requests (#3345)

Author: AndreasArvidsson

.github/workflows/pr-labels-events.yml

@@ -0,0 +1,15 @@
+name: PR labels events
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+  pull_request_review:
+    types: [submitted, dismissed]
+
+permissions: {}
+
+jobs:
+  signal:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "PR labels event received"

.github/workflows/pr-labels.yml

@@ -0,0 +1,17 @@
+name: PR labels
+
+on:
+  workflow_run:
+    workflows: [PR labels events]
+    types: [completed]
+
+permissions:
+  pull-requests: write
+
+jobs:
+  labels:
+    if: github.event.workflow_run.conclusion == 'success'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Update PR labels
+        uses: AndreasArvidsson/gh-pr-labeler@v1.4.0