Merge pull request 'renovate/renovate: Update once a week and allow automerge' (#500) from renovate-config into master

Reviewed-on: Netz39_Admin/netz39-infra-ansible#500

host-pottwal.yml

@@ -638,6 +638,7 @@
       tags:
         - spaceapi
 
+    # Renovate configuration is sourced from `renovate.json` in each repository
     - name: Ensure renovate bot cronjob is present
       ansible.builtin.template:
         src: templates/pottwal/renovate-cron.j2

renovate.json

@@ -15,8 +15,10 @@
   ],
   "packageRules": [
     {
+      "matchDatasources": ["docker"],
       "matchPackageNames": ["renovate/renovate"],
-      "schedule": [ "on friday" ]
+      "schedule": [ "before 1am on friday" ],
+      "automerge": true
     }
   ]
 }