these 3 derivations will be built:
  /nix/store/lyia1m336sjj7wqdjvhpkmkdrza6435v-docker-image-sources.drv
  /nix/store/xx6nl7y67xbdmk4gx5n0jnfzg8ckd1nl-docker-image-inputs.drv
  /nix/store/0h9vp54504pj4iz38halpzxyglic9zwk-docker-image-inputs-hash.drv