Enable nextcloud kubernetes cronjobs

From the nextcloud readme:

This chart can utilize Kubernetes CronJob resource to execute background tasks.

To use this functionality, set cronjob.enabled parameter to true and switch background mode to Webcron in your nextcloud settings page. See the Configuration section for further configuration of the cronjob resource.

This means we should also make sure to "switch background mode to Webcron", maybe with occ?

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information