Postgres setup

[ranguard]

https://cloudnative-pg.io/

See #51

TODO:

Should we think about saving backups somewhere? - currently only for Minon but eventually might be more important stuff?

[ssoriche]

We can back up to storage box. There is 3 copies of the data in Postgres and we can snapshot to storage box on a regular cadence.

[ranguard]

https://cloudnative-pg.io/ can also backup to S3

[ranguard]

Closed by: b8c5751

Docs are: https://docs.digitalocean.com/products/kubernetes/how-to/use-operator/