this derivation will be built:
  /nix/store/06xm3sa4c7vbk8is3ldf2p1lza6mzgfj-inputDerivation-gh-pages.drv
building '/nix/store/06xm3sa4c7vbk8is3ldf2p1lza6mzgfj-inputDerivation-gh-pages.drv'...