these 2 derivations will be built:
  /nix/store/i5ph7p70yn2c7fwqhh6mlqkl12w7nk3m-flake-inputs.drv
  /nix/store/r4vyvv7gv6wabgzzhhp0zn8z6q9wfj3h-check-flake-inputs.drv