fix CI Docker stage

.gitlab-ci.yml

@@ -51,7 +51,7 @@ docker:build:
   script:
     - docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN $CI_REGISTRY
     - echo "Building Dockerfile..."
-    - docker build --pull -t sigma-backend:${CI_APPLICATION_TAG} -t sigma-backend:latest .
+    - docker build --pull -t ${CI_APPLICATION_REPOSITORY}:${CI_APPLICATION_TAG} -t sigma-backend:latest .
     - echo "Pushing to GitLab Container registry $CI_APPLICATION_REPOSITORY..."
     - docker push ${CI_APPLICATION_REPOSITORY}:${CI_APPLICATION_TAG}
     - docker push ${CI_APPLICATION_REPOSITORY}:latest