these 2 derivations will be built:
  /nix/store/ckhn8ll2fj3pnrn7p5zhfgvq6x7f5a8y-flake-inputs.drv
  /nix/store/vl9jgi4b04zc0z90d4i3vsjdsdlkqfzy-check-flake-inputs.drv