stop pushing every circle build to dockerhub

.circleci/config.yml

@@ -48,7 +48,6 @@ jobs:
             export DOCKER_DEPLOY="${DOCKER_DEPLOY:-false}"
             if [ "${CIRCLE_BRANCH}" == "master" ]; then
               bin/ci/deploy-dockerhub.sh latest
-              bin/ci/deploy-dockerhub.sh "circle_build_$CIRCLE_BUILD_NUM"
             fi
 
             # $CIRCLE_TAG doesn't exist anymore