Update script logic for validating tag (#3237)

Co-authored-by: “shaun-nx” <“s.odonovan@f5.com”>

hack/docker.sh

@@ -6,7 +6,7 @@ docker_tag=edge
 
 commit_tag=$(git tag --contains ${git_commit})
 
-if [[ ${commit_tag} == ${git_tag} ]]; then
+if [[ ${commit_tag} == *${git_tag}* ]]; then
     # we're on the tag, use the docker image for the tag
     docker_tag=${git_tag//v/}
     echo ${docker_tag}