Project config inheritance?

Is your feature request related to a problem? Please describe.

I'm not seeing a way to inherit from another config.

Describe the solution you'd like

I would love it if there was a way to create a high level config that can be inherited for projects. For example, I might create a rails.yml file, and for Rails projects I would inherit from that and add paths and variations in my-rails-project.yml.

Describe alternatives you've considered

Maybe using ERB to read in a generic config? That might get a bit more complicated if it comes to merging nested keys, though.

Additional context

Love this project, thanks!