ci: archive urls weekly

Author: JesperDramsch

.github/workflows/archive-new-urls.yml

@@ -2,7 +2,9 @@ name: Check New Conference URLs
 
 on:
   schedule:
-  - cron: '0 0 * * *' # Runs at 00:00 UTC every day
+  # Runs at 00:00 UTC on Friday
+  # https://crontab.guru/#0_0_*_*_6
+  - cron: '0 0 * * 6'
   workflow_dispatch:
     # Allows manual triggering