these 3 derivations will be built:
  /nix/store/kjmr715zrwmvi3xfcv1p0cw42ahpmh8a-docker-image-sources.drv
  /nix/store/3cjkybbaw2d2pmcvinjdm613w3skv5g1-docker-image-inputs.drv
  /nix/store/80249pcq0hkn82wms7vclkjzrzzvnl88-docker-image-inputs-hash.drv