nix-build '<nixpkgs/nixos>' -I nixos-config=./configuration.nix -A system.build.isoImage
{ pkgs, ... }:
let
pressure = pkgs.callPackage ./pressure.nix {};
{
imports = [ <nixpkgs/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix> ];
systemPackages = [ pressure ];
}