Fix flawed logic for selecting latest published serivce container
Fix flawed logic for selecting latest published serivce container

previously we were using master rev but now that containers
are not published for every revision that doesn't work
using latest tag will work for latest published version of
service as of the test run.

Signed-off-by: Elliot Murphy <014ce8fab4ab9f8a957bfe9f974379093994de97@users.noreply.github.com>

kindlyops/mappamundi,kindlyops/mappamundi,kindlyops/mappamundi,kindlyops/mappamundi,kindlyops/mappamundi,kindlyops/mappamundi,kindlyops/mappamundi,kindlyops/mappamundi