Add GitHub Actions workflow for auto labeling PRs

Author: asong56

auto-label.yml

@@ -1 +1,21 @@
+name: Auto Label
 
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  label:
+    name: Apply labels
+    runs-on: ubuntu-latest
+    steps:
+      - name: Label PR by changed files
+        uses: actions/labeler@v5
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          configuration-path: labeler.yml
+          sync-labels: true