remove the echo of $CI_COMMIT_TAG

.gitlab/ci/ci.yml

@@ -44,9 +44,8 @@ docker_push:
         - docker info
     script:
         - docker login -u $DOCKER_USERNAME -p $DOCKER_PASSWORD
-        - echo $CI_COMMIT_TAG
         - |-
-            if [[ $CI_COMMIT_TAG == "" ]]; then
+            if [[ -z "$CI_COMMIT_TAG" ]]; then
               docker build -t $DOCKER_IMAGE_LATEST .
               docker push $DOCKER_IMAGE_LATEST
             else