remove image after push

.gitlab-ci.yml

@@ -228,6 +228,8 @@ Build Docker Image:
     ## push image to user or project registries
     - docker tag "${LOCAL_IMAGE}" "${PROJECT_IMAGE_NAME}";
     - docker push "${PROJECT_IMAGE_NAME}";
+    - docker image rm "${PROJECT_IMAGE_NAME}" # removes local image after pushing
+
     
   stage: integration
   tags: