this derivation will be built:
  /nix/store/x6dw3qqjg3h24f1h7v8vjj48n2yaqr6x-inputDerivation-gh-pages.drv
building '/nix/store/x6dw3qqjg3h24f1h7v8vjj48n2yaqr6x-inputDerivation-gh-pages.drv'...