fix build branch pipeline

build/Jenkinsfile.branch

@@ -128,16 +128,16 @@ pipeline {
           withCredentials([usernamePassword(credentialsId: 'matterbuild-docker-hub', usernameVariable: 'DOCKER_USER', passwordVariable: 'DOCKER_PASS')]) {
             sh 'docker login --username ${DOCKER_USER} --password ${DOCKER_PASS}'
             sh """
-            export GIT_COMMIT=$(git rev-parse --short HEAD)
             export TAG='${env.BRANCH_NAME}'
-            docker build --no-cache --build-arg MM_PACKAGE=https://releases.mattermost.com/mattermost-platform/${env.BRANCH_NAME}/mattermost-enterprise-linux-amd64.tar.gz -t mattermost/mattermost-enterprise-edition:\${TAG} -t mattermost/mattermost-enterprise-edition:\${GIT_COMMIT} build
-            docker push mattermost/mattermost-enterprise-edition:\${TAG} mattermost/mattermost-enterprise-edition:\${GIT_COMMIT}
+            export GIT_HASH=\$(git rev-parse --short HEAD)
+            docker build --no-cache --build-arg MM_PACKAGE=https://releases.mattermost.com/mattermost-platform/${env.BRANCH_NAME}/mattermost-enterprise-linux-amd64.tar.gz -t mattermost/mattermost-enterprise-edition:\${TAG} -t mattermost/mattermost-enterprise-edition:\${GIT_HASH} build
+            docker push mattermost/mattermost-enterprise-edition:\${TAG} mattermost/mattermost-enterprise-edition:\${GIT_HASH}
             """
             sh """
-            export GIT_COMMIT=$(git rev-parse --short HEAD)
             export TAG='${env.BRANCH_NAME}'
-            docker build --no-cache --build-arg MM_PACKAGE=https://releases.mattermost.com/mattermost-platform/${env.BRANCH_NAME}/mattermost-team-linux-amd64.tar.gz -t mattermost/mattermost-team-edition:\${TAG} -t mattermost/mattermost-team-edition:\${GIT_COMMIT} build
-            docker push mattermost/mattermost-team-edition:\${TAG} mattermost/mattermost-team-edition:\${GIT_COMMIT}
+            export GIT_HASH=\$(git rev-parse --short HEAD)
+            docker build --no-cache --build-arg MM_PACKAGE=https://releases.mattermost.com/mattermost-platform/${env.BRANCH_NAME}/mattermost-team-linux-amd64.tar.gz -t mattermost/mattermost-team-edition:\${TAG} -t mattermost/mattermost-team-edition:\${GIT_HASH} build
+            docker push mattermost/mattermost-team-edition:\${TAG} mattermost/mattermost-team-edition:\${GIT_HASH}
             docker logout
             """
           }