fix(ci): remove image from registry if tests fail

Author: Pouyanpi

.gitlab-ci.yml

@@ -83,7 +83,7 @@ docker-test:
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
   script:
     - docker pull $IMAGE_TAG
-    - docker run --rm $IMAGE_TAG pytest
+    - docker run --rm $IMAGE_TAG pytest || (docker rmi $IMAGE_TAG && exit 1)
   only:
     - tags
   tags: