Help making a flake (for Geant4 (particle physics framework) examples)

[jacg]

@jacg

The executable absolutely needs to know the location of the G4 datasets […] which seems to happen automatically in nix develop (I’m not sure how), but I don’t know how to make that happen for nix shell or nix run .

Maybe this should be done with wrapProgram? But I don’t see how to automate extraction of the settings provided by ${geant4}/nix-support/setup-hook into a form that can be consumed by wrapProgram.