chore: cleanup mirror_to_codeberg.yml workflow

- Remove redundant daily cron schedule (already runs on push to main)
- Add concurrency control to cancel old runs
- Improve formatting and add clarifying comments
- Add push trigger for main branch

Author: igorpecovnik

.github/workflows/mirror_to_codeberg.yml

@@ -1,19 +1,34 @@
 # Pushes the contents of the repo to the Codeberg mirror
 name: Mirror to Codeberg
+
 permissions:
   contents: read
+
 on:
+  push:
+    branches:
+      - main
   workflow_dispatch:
-  schedule:
-    - cron: '30 4 * * *' # Daily at 4:30
+
+# Cancel older runs if a new one starts (per workflow + branch)
+concurrency:
+  group: ${{ github.workflow }}-${{ github.repository }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   codeberg:
+    # Extra safety so forks don't try to run it
     if: ${{ github.repository == 'armbian/build' }}
     runs-on: ubuntu-latest
+
     steps:
-      - uses: actions/checkout@v6
-        with: { fetch-depth: 0 }
-      - uses: pixta-dev/repository-mirroring-action@v1
+      - name: Checkout full history
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Mirror to Codeberg
+        uses: pixta-dev/repository-mirroring-action@v1
         with:
           target_repo_url: [email protected]:armbian/build.git
           ssh_private_key: ${{ secrets.GHA_SSH_KEY }}