these 3 derivations will be built:
  /nix/store/3c9kr8ccch1rgwa9aw35drmaxh5fscb7-source.drv
  /nix/store/plwypgfwk74cbj94z3sgj423cc2ssrk1-spec-kit-1.2.0.drv
  /nix/store/9xf9gwby1qnqpc99fig5yiqpsd7l6n69-check-spec-kit.drv