these 3 derivations will be built:
  /nix/store/hbd93sckn37bxini4yhfps3ig0vkvkzd-docker-image-sources.drv
  /nix/store/066x7npk5j863f2vbil4blz8c3yp7zms-docker-image-inputs.drv
  /nix/store/v5z8ypx7gfgjmb7bjgaxd7gbqxlx1121-docker-image-inputs-hash.drv