feat: makefile advancements

- add test target
- update clean target

Makefile

@@ -28,6 +28,10 @@ push: tag
 # Clean up dangling Docker images
 clean:
 	docker image prune -f
+	sudo docker rm jupyterinstance
+
+test:
+	sudo docker run -it --name jupyterinstance --entrypoint /bin/bash -v jupyterhub-test:/home/jupyter/work $(REGISTRY)/$(OWNER)/$(IMAGE_NAME):latest
 
 # Default target
 default: build