these 3 derivations will be built:
  /nix/store/0vi0spd9icv5nz20g1qkiq1n98xmf4sf-docker-image-sources.drv
  /nix/store/vnrkkgy0v8lqfilzd6xma04kzbz06vlx-docker-image-inputs.drv
  /nix/store/yqbq0naix2j0l5z2affg777zavrqxx86-docker-image-inputs-hash.drv