Allow PIXL DB to be run on a different database

[stefpiatek]

Definition of Done / Acceptance Criteria

As a system administrator, I'd like to make sure that PIXL DB (pipeline schema where we store Extracts and Images) can be configured to run on another database, rather than one running in docker so that it can be backed up.

Testing

• Extra env variables for testing should just use the docker database

Documentation

No response

Dependencies

No response

Details and Comments

Will need to alter the configuration to ensure that there is a PIXL_DB set of environmental variables, and then another set for ORTHANC_RAW_DB. In testing and development these can be set to the same docker postgres instance.