sg: use docker volumes by default in redis-postgres, fix args
Created by: bobheadxi
- Switch to using docker volumes by default for persisting postgres data. This seems to work just fine, and mounting disks seems prone to issues.
- Gave pg volume a version-specific name, since I ran into an issue here with an existing volume of the same name.
- The postgres arguments for user/password were flipped
🤔 Switched them around