these 3 derivations will be built:
  /nix/store/2psgbw95k7b7zzxm8mpxzldi7ahg24wq-docker-image-sources.drv
  /nix/store/q0ycjga10y112x6bz62n1rgvaf6brl0g-docker-image-inputs.drv
  /nix/store/c334d9047gm9dh7x6q852agjg9x2nbk6-docker-image-inputs-hash.drv