It is scala-native helloworld project, which doesn't require any setup besides having nix, all required dependencies are provided by it. Moreover, it demonstrates how to package scala-native program to nix, so it could be used elsewhere.

nix-build
./result/bin/random-sum

To build docker image (currently works only on linux):

nix-build docker.nix -A layered

To hack on the scala project itself, use nix-shell:

nix-shell --command sbt