[BUG] Database env var is not respected in Docker

[PhlexPlexico]

Describe the bug
Reported by a user in Discord, it appears that there are still some hardcoded values in the package.json during database creation. This should be changed to be more dynamic, or fix it in the Dockerfile to ensure the right database is being set.

To Reproduce
Steps to reproduce the behavior:
Create a Docker compose file with a different database other than get5 and it will fail trying to create the database.

Expected behavior
Should create the properly named database.