Backups for docmost + nocodb

[b-n]

Add some backup cronjobs for nocodb and docmost!

These are kinda rough/ready backups. Both nocodb and docmost have a storage directory (for images etc), and also of course data in their respective database.

How does the restore process work? Yes
Where are the backups stored? On a hetzner storage box (another ~3.5 eur/month)
How can we extract the backups if we ever need them? At present, I'm the only one with the keys here. I'll do some thinking about the best way to share this. (see below)
Why did we need new containers? I couldn't find any open/maintained images that had both psql + ssh. It would be nice to not have to manage some containers, but not the end of the world. Could also manage this automagically with github actions in theory.

Storage box file structure:

|   # root user (me)
\- k3s    # sub-1
   |- nocodb   # sub-2
   |   \- backups
   |       |- pg_backup_<date>.tar.gz
   |       \- file_backup_<date>.tar.gz
   \- docmost   # sub-3
       \- backups
           |- pg_backup_<date>.tar.gz
           \- file_backup_<date>.tar.gz

☝️ Each individual service (docmost/nocodb) has it's own set of ssh keys to access the storage box. This means if one service gets pwned, at least it doesn't pwn the other. The good news is that I had some foresight to have a separate account for the k3s directory, which means we could create some ssh keys there, and share them in the keepass for emergency access etc.

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