Updated gitlab-ci.yml to remove images after push and build

.gitlab-ci.yml

@@ -27,11 +27,13 @@ docker-build:
   stage: docker-build
   image: docker:latest
   script:
+    - docker rmi $IMAGE_TAG $IMAGE_TAG_LATEST
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
     - docker build --no-cache --pull -t $IMAGE_TAG .
     - docker push $IMAGE_TAG
     - docker tag $IMAGE_TAG $IMAGE_TAG_LATEST
     - docker push $IMAGE_TAG_LATEST
     - docker rmi $IMAGE_TAG $IMAGE_TAG_LATEST
+
   only:
   - tags