these 3 derivations will be built:
  /nix/store/hvryi23gc00h8p4msfcraasz6pxrzki6-docker-image-sources.drv
  /nix/store/qapxrsj7kkrg3w05bh2ymw63z4il4jml-docker-image-inputs.drv
  /nix/store/rj7vmcazih69c8wsg06mjzjfq3hqx1v1-docker-image-inputs-hash.drv