these 4 derivations will be built:
  /nix/store/9lkjh5ngrlk0lflskn5nd7cbl4m2gsv7-docker-image-packages-manifest.drv
  /nix/store/r406imq5jp28qg35rq3vxqcn9mxssacd-docker-image-sources.drv
  /nix/store/375i87ayfzj3p4l0g5r2apvag9iv1nsp-docker-image-inputs.drv
  /nix/store/piwzyvck3i45ybfwlvfxpgz5hy84wxsg-docker-image-inputs-hash.drv