these 3 derivations will be built:
  /nix/store/x83wjhw3q6rgz80b06p18w6cvg1415zk-docker-image-sources.drv
  /nix/store/ic350d3y3dhyin7awjz60w2mpzaj1rr1-docker-image-inputs.drv
  /nix/store/8rmp5cg7dr9vznwvyrsiiv40dvgspvi9-docker-image-inputs-hash.drv