Run the conversion weekly

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XqsmB8BBnudp4djsjWpk11

.gitea/workflows/convert.yaml

@@ -2,9 +2,9 @@ name: Convert BeST addresses
 run-name: Convert BeST addresses to csv (${{ gitea.ref_name }})
 
 on:
-  push:
-    branches:
-      - '**'
+  schedule:
+    # every monday at 03:00 UTC
+    - cron: '0 3 * * 1'
   workflow_dispatch:
 
 permissions: