ci: schedule the workflow to run weekly

Author: Raj-StepSecurity

.github/workflows/auto_cherry_pick.yml

@@ -8,6 +8,9 @@ on:
         required: true
         default: "main"
 
+  schedule:
+    - cron: "0 0 * * 1"
+
 permissions:
   contents: write
   pull-requests: write