Add labeler action from github

Signed-off-by: Jerome Luckenbach <github@luckenba.ch>

.github/workflows/labeler.yml

@@ -0,0 +1,16 @@
+name: Labeler
+on:
+  pull_request:
+    types: [open,synchronize,reopen]
+  schedule:
+    - cron: '0/15 * * * *'
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: paulfantom/periodic-labeler@v0.0.1
+      env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_REPOSITORY: ${{ github.repository }}
+          LABEL_MAPPINGS_FILE: .github/labeler.yml