these 3 derivations will be built:
  /nix/store/5di1kkgxwdqzw453dahd1v985qq65xrv-docker-image-sources.drv
  /nix/store/h8x21adwg29jn7riww9sdyivvknwmk1z-docker-image-inputs.drv
  /nix/store/4fvl1a8zxpgacw2mxzrii63xxdi87824-docker-image-inputs-hash.drv