these 3 derivations will be built:
  /nix/store/gx6in5px208wbrfz5lviqg8b9n91cjdm-docker-image-sources.drv
  /nix/store/2fmb4dg0x23jnwwzawd0vsz2h6haaxb1-docker-image-inputs.drv
  /nix/store/61jvz0k2j1qgnp1yrxpy3kxih8iqdv0y-docker-image-inputs-hash.drv