these 4 derivations will be built:
  /nix/store/pg4fwr5w7bgk54wdh12q2gw91jxswy6a-docker-image-packages-manifest.drv
  /nix/store/zra4l6bx41dn3xwhqpyjn57k1qkbmb42-docker-image-sources.drv
  /nix/store/cwwnnmqzygmalwz5bgym1b9bpnh6ygfx-docker-image-inputs.drv
  /nix/store/pygz5ii874pkkxm4pkx22dmgi3ggvj4g-docker-image-inputs-hash.drv