these 2 derivations will be built:
  /nix/store/21dif2lcqswspnqg6c5cp81c3dbj7i4q-DockerSandboxes-darwin.tar.gz.drv
  /nix/store/4c1pzz9cirl4ssg3nn89b2bidz7s57v9-docker-sbx-0.43.0.drv