Add labels workflow

.github/workflows/labels.yml

@@ -0,0 +1,23 @@
+name: labels
+
+on:
+  push:
+    branches:
+      - 'dev'
+    paths:
+      - '.github/labels.yml'
+      - '.github/workflows/labels.yml'
+
+jobs:
+  labeler:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2.3.1
+      -
+        name: Run Labeler
+        if: success()
+        uses: crazy-max/ghaction-github-labeler@v2.1.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}