Provide an automated restore script

[Akruidenberg]

It would be nice to have an option to restore an backup with this container. Commands like "docker exec autobackup db-backup restore --all"

[RealOrangeOne]

Backup is a bit more complex, especially trying to do it in an automated way like this. For example, if some databases exist in the container but not others, it's not obvious what the correct process is. Similarly, it's no longer a scheduled task, it'd just run eg pg_restore against a few servers.

I'd definitely review a PR to add this functionality if it can be done reliably, but I doubt it's something I'll add myself.