Incorporate compressed SQL dumps into the process

[znmeb]

At the moment, the team is working with backups using the pg_dump custom format. There have been problems restoring these to the PostgreSQL version that's in Amazon Linux 2, and I don't know if they've been fixed. We've tested the "plain-text" format - compressed SQL - and they work.

So at some point the team needs to start producing compressed SQL dumps. I have code to convert one format to the other in https://github.com/hackoregon/data-science-pet-containers/tree/master/examples/reowning_a_database. If you show me where you're currently making the backup files I can help you integrate it.