GNU Guix systemd daemon for NixOS

  # Derived from Guix guix-daemon.service.in
  # https://git.savannah.gnu.org/cgit/guix.git/tree/etc/guix-daemon.service.in?id=00c86a888488b16ce30634d3a3a9d871ed6734a2
  systemd.services.guix-daemon = {
    enable = true;
    description = "Build daemon for GNU Guix";
    serviceConfig = {
      ExecStart = "/var/guix/profiles/per-user/root/guix-profile/bin/guix-daemon --build-users-group=guixbuild";
      Environment="GUIX_LOCPATH=/root/.guix-profile/lib/locale";
      RemainAfterExit="yes";
      StandardOutput="syslog";
      StandardError="syslog";
      TaskMax= 8192;
    };
    wantedBy = [ "multi-user.target" ];
  };