How to build, package and deploy a react-native-web app in a Docker container?
It's a pretty general question, I will try to answer the best I can:
If you want to just build and run an image:
Build the project: npx expo-cli init react_native_app --npm

You need to create a Dockerfile file in your repository
Docker build -t {tag_name} . (You can replace '.' eith the Dockerfile path)
Docker run...
If you want you can create docker compose file to better control your app.
Reference:
https://www.rockyourcode.com/how-to-run-react-native-expo-web-in-a-docker-container/