chore(workflow): add mirror workflow

Author: Ly-sec

.github/workflows/codeberg-mirror.yml

@@ -0,0 +1,22 @@
+name: Mirror to Codeberg
+
+on:
+  push:
+    branches:
+      - '**'
+  delete:
+  workflow_dispatch:
+
+jobs:
+  mirror:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout (full mirror)
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Push mirror to Codeberg
+        run: |
+          git remote add codeberg https://${{ secrets.CODEBERG_TOKEN }}@codeberg.org/noctalia-dev/noctalia-shell.git
+          git push --mirror codeberg