Create scheduled database backups

[upkarlidder]

Is your feature request related to a problem? Please describe.
The database currently uses a persistent volume claim, but is not backed up anywhere. We would like to back up the database on a pre determined schedule.

Describe the solution you'd like

• create a Kubernetes job to backup the data. This calls mariadb backup command.
• create a Kubernetes cronjob to run the above job at a regular interval
• the database is backed up to Cloud Object Storage
• look at backing up increments in MariaDB instead of the whole database every time

FYI @hawk4031

Describe alternatives you've considered
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Additional context
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