these 2 derivations will be built:
  /nix/store/nv5p1aa0lq8jlf7wrvnf7i1xvhyjzxgx-flake-inputs.drv
  /nix/store/fk4gmk0vw4539gk9yd1s110khdwfp9kj-check-flake-inputs.drv