these 3 derivations will be built:
  /nix/store/3g8vms57adrn5bhi81n9whfzwrcfn4ny-docker-image-sources.drv
  /nix/store/w0jqv7cx8vmqnfijdirmx6gi70z7g8jg-docker-image-inputs.drv
  /nix/store/d6zb9j1kj1wbg2cvxsiyrifkda81y9sa-docker-image-inputs-hash.drv