chore: run cron schedule only once a week

Updating the docker image only then is plenty often.

Author: kolaente

.github/workflows/docker-publish.yml

@@ -7,7 +7,7 @@ name: Docker
 
 on:
   schedule:
-    - cron: '40 5 * * *'
+    - cron: '40 5 * * 2'
   push:
     branches: [ "main" ]
     # Publish semver tags as releases.