Update the Makefile adding in the targets used by Spinnaker to build artifacts.
Update the Makefile adding in the targets used by Spinnaker to build artifacts.

Bug: b/161897938

Change-Id: Ia54ca39888bbd8164942cda905900f9a1fca648d
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/1710330
Reviewed-by: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Commit-Queue: Ola Karlsson <595fa75913cec2db4957d2d72dd47cbe308f512b@chromium.org>

luci/luci-py,luci/luci-py,luci/luci-py,luci/luci-py