these 3 derivations will be built:
  /nix/store/fhfng4320mq1pjlgd6wnaddvxi2iiqf8-docker-image-sources.drv
  /nix/store/mks3gfhr3l9zn86diynd7rsczcm1gq89-docker-image-inputs.drv
  /nix/store/d6qvpw9fs5275yvai4xbzmrikjllrn0l-docker-image-inputs-hash.drv