these 3 derivations will be built:
  /nix/store/3r2clgnpgs248s9knfqd6x96k3n9d5km-source.drv
  /nix/store/qwxmzqbrl45cfghhs82fas9m48kmv55k-spec-kit-1.3.1.drv
  /nix/store/4rby5j9fr408yqsqc84ql52dg7lp9vxf-check-spec-kit.drv