Read from env vars and cli flag options

[AngelMunoz]

Is your feature request related to a problem? Please describe.
After playing around with a project of mine (https://github.com/AngelMunoz/Openapo) I realized that if I want to run migrondi from CI currently I need to specify a migrondi.json file which is cumbersome to replace by environment or override within CI scripts which is not ideal, the alternative is to have an F# project that is in charge of running the migrations and has the configurations but it would also need to read from the environment or something similar in a manual way, again not ideal.

Describe the solution you'd like

I'd love to have three ways to read the configuration options from the CLI, an example of this was this weird implementation in Perla https://github.com/AngelMunoz/Perla/blob/dev/src/Perla/Configuration.fs#L447-L547

which basically reads in the following way

• file if present
• env vars if present (it was not implemented in perla, but the placeholder fn was there)
• cli args/options if present

Describe alternatives you've considered

• Not do a thing

Additional context

N/A