Ref: Deploy Rails 7.1 To AWS With Docker And Nginx, https://www.youtube.com/watch?v=UmAx1A6ic2M

DHH:

Add Docker files by default to new apps: Dockerfile, .dockerignore, bin/docker-entrypoint. These files can be skipped with --skip-docker. They're intended as a starting point for a production deploy of the application. Not intended for development (see Docked Rails for that).

Example:

docker build -t app .
docker volume create app-storage
docker run --rm -it -v app-storage:/rails/storage -p 3000:3000 --env RAILS_MASTER_KEY=<see config/master.key> app

You can also start a console or a runner from this image:

docker run --rm -it -v app-storage:/rails/storage --env RAILS_MASTER_KEY=<see config/master.key> app console

To create a multi-platform image on Apple Silicon to deploy on AMD or Intel and push to Docker Hub for user/app:

docker login -u <user>
docker buildx create --use
docker buildx build --push --platform=linux/amd64,linux/arm64 -t <user/image> .