This article will cover how to host a NodeJS Express server that serves your Create-React-App website and has an API that communicates with a Document DB, Azure Cosmos DB in this case (We will use MongooseJS to connect). Microsoft Azure also easily supports CI with your GitHub or Bitbucket repo!
https://medium.com/@chrisjr06/creating-mern-stack-app-and-hosting-in-microsoft-azure-using-create-react-app-w-continuous-4acef0c87e71