Run sync workflow on push to main/dev branches

Replace the manual `workflow_dispatch` trigger with a `push` trigger for branches `main`, `dev`, and `dev-1.x`. The scheduled cron remains unchanged. This ensures the upstream sync runs automatically when those branches are updated, rather than requiring a manual dispatch.

Author: mercyblitz

.github/workflows/sync-branches-from-upstream.yml

@@ -11,7 +11,8 @@
 name: Sync Branches from Upstream
 
 on:
-  workflow_dispatch:
+  push:
+    branches: [ 'main' , "dev" , "dev-1.x" ]
   schedule:
     - cron: '*/5 * * * *'