these 3 derivations will be built:
  /nix/store/ijwrmsgr5cxbm6xd0h8z6r0xvb2fhs7c-docker-image-sources.drv
  /nix/store/dzlb6qgb11fx182r331lvsbfdn0h6bfl-docker-image-inputs.drv
  /nix/store/285ri4fzahmbr8xhah8w372jarqkv7wb-docker-image-inputs-hash.drv