this derivation will be built:
  /nix/store/qgif5s4sp69da58q7a7q94i7nfbg9w2k-inputDerivation-gh-pages.drv
building '/nix/store/qgif5s4sp69da58q7a7q94i7nfbg9w2k-inputDerivation-gh-pages.drv'...