these 2 derivations will be built:
  /nix/store/icbcqa8s4vsph35rd5cb77k4741w3x9h-boot.json.drv
  /nix/store/vhlsg1azwwnn7fqpf9jjmixvrqzcwbi8-nixos-system-zaphod-26.11.19800101.a831408.drv