this derivation will be built:
  /nix/store/rr2g871fkd5wairi9k0xkznwm3k7yi7y-inputDerivation-gh-pages.drv
building '/nix/store/rr2g871fkd5wairi9k0xkznwm3k7yi7y-inputDerivation-gh-pages.drv'...