these 3 derivations will be built:
  /nix/store/n08ixck7bh7vjyczmxarykwlzi2smkd4-docker-image-sources.drv
  /nix/store/l4wgd7r70w4mk202c9v3mmgn9ijgrrk3-docker-image-inputs.drv
  /nix/store/b225j3149bz2sdccwnb4h9zs85bwji8x-docker-image-inputs-hash.drv