nixos/dysnomia: replace activation script

    boot.extraSystemdUnitPaths = [ "/etc/systemd-mutable/system" ];

    system.activationScripts.dysnomia = ''

      mkdir -p /etc/systemd-mutable/system

      if [ ! -f /etc/systemd-mutable/system/dysnomia.target ]

      then

          ( echo "[Unit]"

            echo "Description=Services that are activated and deactivated by Dysnomia"

            echo "After=final.target"

          ) > /etc/systemd-mutable/system/dysnomia.target

      fi

    '';

    systemd.targets.dysnomia = {

      description = "Services that are activated and deactivated by Dysnomia";

      after = "final.target";

    };

  };

}