these 3 derivations will be built:
  /nix/store/rxh8d626hlkmsnrci2qjvp0v8m1a3360-docker-image-sources.drv
  /nix/store/nh4dkk7xgkicyawsh7c5fj2i1hi71x9i-docker-image-inputs.drv
  /nix/store/hc97v05vgw6bc8v31kgjw4sqf7h3lxzb-docker-image-inputs-hash.drv