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Several weeks ago, I wrote an article on building an application with Flask, NextJS and Docker. In that article, I described how to dockerize a flask application for the backend, next for the frontend and Nginx for a reverse-proxy server. I also show a way to run all container easily for local development using `docker-compose` and deploy it directly to Digital Ocean using `docker-machine`. The setup, I describe on that article is sufficient enough if you're still playing around on a toy project. In a real-world, with a team-based, collaborative environment, it's difficult only to allow a local machine deployment. Therefore, we need technology that allows us safely and automatically deploy the application to the cloud server.