change cron schedule from daily to weekly

Author: zhaochunqi

.github/workflows/publish.yml

@@ -2,7 +2,7 @@ name: Build and Publish Docker Image
 
 on:
   schedule:
-    - cron: '0 0 * * *' # Daily at midnight UTC
+    - cron: '0 0 * * 0' # Weekly on Sunday at midnight UTC
   push:
     branches:
       - main