Adds auto-update to containers, enables auto-update for root, sync only at 8 and 20, excludes some files from sync

quadlets/nginx/nginx.container

@@ -6,6 +6,7 @@ AutoUpdate=registry
 ContainerName=nginx
 Environment=TZ=Europe/Zurich
 Image=docker.io/nginx:latest
+Label=io.containers.autoupdate=registry
 Pod=nginx.pod
 StartWithPod=true
 Timezone=Europe/Zurich