create labels sync action

Author: paulfantom

.github/workflows/labels.yml

@@ -0,0 +1,13 @@
+name: Sync labels in the declarative way
+on: [push]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/[email protected]
+      - uses: micnncim/action-label-syncer@latest
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_REPOSITORY: ${{ github.repository }}
+        with:
+          manifest: labels.yml # default: .github/labels.yml