fix jenkinsfile for branch build

build/Jenkinsfile.branch

@@ -123,7 +123,7 @@ pipeline {
             sh """
             export TAG='${env.BRANCH_NAME}.${env.BUILD_NUMBER}.${SERVER_GIT_COMMIT}'
             docker build --no-cache --build-arg MM_PACKAGE=https://releases.mattermost.com/mattermost-platform/${env.BRANCH_NAME}/mattermost-enterprise-linux-amd64.tar.gz -t mattermost/mattermost-enterprise-edition:\${TAG} build
-            docker push mattermost/mattermost-enterprise-edition:${GIT_COMMIT_SHORT}
+            docker push mattermost/mattermost-enterprise-edition:\${TAG}
             docker logout
             """
           }