these 3 derivations will be built:
  /nix/store/i4gzqpvcx29313bay0jmpfvk24ar95cn-docker-image-sources.drv
  /nix/store/d3xfk6b2m2s96c488gx60hsn12ll6w7z-docker-image-inputs.drv
  /nix/store/4i0lhblgbavj3q7m3znv9psyg6zcz8xm-docker-image-inputs-hash.drv