these 3 derivations will be built:
  /nix/store/8vb99y57ac6vaq1flcyqlhis33gfymcw-docker-image-sources.drv
  /nix/store/cw39235zbaqv5zpacsj2gfb2p35y701j-docker-image-inputs.drv
  /nix/store/lrdh4fxfpn4ygfx03692vb60kzswyvr6-docker-image-inputs-hash.drv