Is your feature request related to a problem? Please describe.
We have conventions around app configuration for our existing services which includes using convict to access configuration, either through the environment or arguments.

We would like to avoid having a one off different system for cube where we must opaquely rely on environment variables.

Describe the solution you'd like
All configuration options here should be available in the cube.js/cube.ts file so that we can decide how to populate these values.

Describe alternatives you've considered
Using environment variables as cube intends.