these 2 derivations will be built:
  /nix/store/g1f6xg4hnymcvvjbnwfiqvfrdxbncilh-flake-inputs.drv
  /nix/store/d7bk6zx45bk9nzsg4z1hqh3wf1c76yqw-check-flake-inputs.drv