Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -2,6 +2,7 @@
 variables:
   SPRING_PROFILES_ACTIVE: gitlab
   DOCKER_HOST: $DOCKER_HOST_BIO
+  IMAGE_TAG: ${CI_COMMIT_TAG:latest}
 
 #services:
 #  - docker:dind
@@ -59,8 +60,8 @@ docker-build:
   stage: build
   image: docker:git
   script:
-    - docker build -t $DOCKER_NAMESPACE/gateway:${CI_COMMIT_TAG:latest} .
-    - docker save -o build/image.tar $DOCKER_NAMESPACE/gateway:${CI_COMMIT_TAG:latest}
+    - docker build -t $DOCKER_NAMESPACE/gateway:$IMAGE_TAG .
+    - docker save -o build/image.tar $DOCKER_NAMESPACE/gateway:$IMAGE_TAG
   artifacts:
     paths:
       - build/image.tar