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nix-build '<nixpkgs/nixos>' -I nixos-config=/home/clever/configuration.nix --argstr system x86-64_linux
nix-copy-closure result --to root@ec2
ssh root@ec2 /nix/store/hash-something/bin/switch-to-configuration switch/boot/test (whatever you want)

{ pkgs, ... }:

{
  environment.systemPackages = with pkgs; [ hello ];
}