these 3 derivations will be built:
  /nix/store/8ndwvz1fd4m2skd29xvlw5i4l0cb52hm-source.drv
  /nix/store/hcfjhqgdycazlnfjzn0cpnrr96dxdlp6-spec-kit-1.2.6.drv
  /nix/store/dblgpbfxaqjv1bxd5d0i3g3fnvvq6xa6-check-spec-kit.drv