nix-update-auto() {
  local args base_branch=master branch current_branch package package_name=() version versions
  package="${*: -1}"
  case $package in
    python:*)
      IFS=" " read -r -a package_name <<<"${package//:/ }"
      package="python310Packages.${package_name[1]}"
      set -- "${@:1:$#-1}" "$package"
      ;;
    *) ;;

  esac \
    ;
  args=($(getopt --unquoted --options "hf:v:r:" --long "help,build,test,commit,version-regex:,run:,shell:,version:" -- "$@"))
  (
    set -e
    for branch in master staging-next staging; do
      versions+="$(nix eval --raw ".?ref=$branch#$package.version")\n"
    done
    if ! [[ $(echo -e "$versions" | sort -u | wc -l) != 1 ]]; then
      echo "Package has different versions on master and different staging branches. Please check manually."
      nix versions "$package"
      read -r -n 1 -p "Continue? [any/Ctrl-C]"
      echo
    fi
    current_branch="$(git rev-parse --symbolic-full-name --abbrev-ref HEAD)"
    if [[ $current_branch != "${args[*]: -1}" && $current_branch != python-updates ]]; then
      if [[ ${*: -1} =~ (libva|python.*Packages.(asgiref|attrs|babel|certifi|cryptography|cython|ddt|httpbin|hypothesis|jsonschema|libcst|lxml|paramiko|pbr|pillow|pycares|pygments|pylint|requests|typed-ast|types-typed-ast|urllib3|xmltodict|zipp)|rust-cbindgen) ]]; then
        echo "Targeting staging..."
        base_branch="$(git merge-base upstream/master upstream/staging)"
        export GIT_NEXT_PUSH_TARGET_BRANCH="$base_branch"
      fi
      git checkout -b "${args[@]: -1}" "$base_branch"
    fi
    nix-update --build --commit "${args[@]}"
    if [[ $current_branch != python-updates ]]; then
      git push
    fi
  )
}

Looks like it is currently failing to build with the error

package github.com/Khan/genqlient: no Go files in /build/source/vendor/github.com/Khan/genqlient