these 3 derivations will be built:
  /nix/store/mhbn8ixxgmpbcjzkila08p9c5d0bsjry-docker-image-sources.drv
  /nix/store/pfjdbjbv3nlgjvj5ydp7cadpb4c392lp-docker-image-inputs.drv
  /nix/store/paq0wlhharwh66qsqlx0l6h138wblgrf-docker-image-inputs-hash.drv