this derivation will be built:
  /nix/store/gb6q0ir9lnlx4pmvng0fq22fp5g1w41y-inputDerivation-gh-pages.drv
building '/nix/store/gb6q0ir9lnlx4pmvng0fq22fp5g1w41y-inputDerivation-gh-pages.drv'...