these 3 derivations will be built:
  /nix/store/nc4r9scpfx2pmijh1hzp9mdbirrgccdk-source.drv
  /nix/store/799ka2driln6jz4vjpchjz5p7zb84x4j-spec-kit-1.0.9.drv
  /nix/store/4nal42fp0rqkdn159hfjn7fm35zksy5w-check-spec-kit.drv