package in nixpkgs

[phanirithvij]

Mainly because the nix build was not getting proper attention here, if it is on nixpkgs it gets more eyes.

[phanirithvij]

NixOS/nixpkgs#413631

[Elinvention]

Thank you for helping me moving things forward.

I found another problem: on a system without efibootmgr installed, the app can't find it. I think I corrected this by moving efibootmgr and linux-utils from nativeBuildInputs to buildInputs. Does it make sense?