CBD-4412: Don't tag any version containing a hyphen with latest

Change-Id: Ie2f5e3c9f0d8051001f486e17ab20adfbe215b84
Reviewed-on: http://review.couchbase.org/c/build-tools/+/163589
Reviewed-by: Chris Hillery <[email protected]>
Tested-by: Blair Watt <[email protected]>

Author: udkyo

k8s-microservice/jenkins/couchbase-k8s-microservice-docker.sh

@@ -20,7 +20,7 @@ highest_version=$(
 
 # Compute tag(s) to push
 version_build=${VERSION}-${BLD_NUM}
-if [ ${highest_version} = ${VERSION} ]; then
+if [[ ${highest_version} = ${VERSION} && "${VERSION}" != *"-"* ]]; then
     tags="${version_build} latest"
 else
     tags="${version_build}"