add github action for autosync

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/repo-sync.yml

@@ -0,0 +1,19 @@
+on:
+  schedule:
+  - cron:  "*/15 * * * *"
+  workflow_dispatch:
+
+jobs:
+  repo-sync:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        persist-credentials: false
+    - name: repo-sync
+      uses: repo-sync/github-sync@v2
+      with:
+        source_repo: "https://git.thalheim.io/Mic92/stockholm.git"
+        source_branch: "master"
+        destination_branch: "master"
+        github_token: ${{ secrets.PAT }}