Or there’s a good reason, including a technical one, it’s rather not to be done / explored?
Environment defines the compilation, because there are some compile-time inputs like MIX_ENV or other env variables, or compilation of native dependencies (like NIFs or PortDrivers) is also bound to the environment of the builder.
There are plenty of tools which make builds idempotent, isolate the environment, cache builds and define the inputs of the package. I’d suggest using nix
