chore: run autoupdate branch on cron schedule

Author: nschonni

.github/workflows/autoupdate-branch.yml

@@ -3,6 +3,8 @@ on:
   push:
     branches:
       - main
+  schedule:
+    - cron: '*/30 * * * *' # every 30 minutes
 jobs:
   autoupdate:
     name: autoupdate