I’d like to make an installation tarball with a custom set of packages. I’ve been pointed to [1], which is a Hydra job. Is it possible without Hydra? Could anyone explain in detail what I need to do? (It’d be great to create a wiki page for this.) [1] https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/make-tarball.nix