New try to fix CI.

.gitlab-ci.yml

@@ -12,8 +12,8 @@ build:
         stage: build
         script:
                 - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
-                - docker build -t backend/$IMAGE_TAG .
-                - docker push backend/$IMAGE_TAG
+                - docker build -t $IMAGE_TAG backend/
+                - docker push $IMAGE_TAG
 
 
 .test_template: &test_definition