these 2 derivations will be built:
  /nix/store/k6bn1s22hgyvq6wlzx0ww7ylgzka6y84-flake-inputs.drv
  /nix/store/nqk1lbhwcm8xbdbpwl9h9sm60q8xnr6p-check-flake-inputs.drv