To run the container

1. docker-compose build
2. docker-compose up db
3. in a separate shell, docker-compose run --rm --service-ports ruby_dev

To run the server in the container

1. bundle install
2. rake db:create
3. rake db:migrate
4. rake db:seed
5. ./bin/webpack-dev-server &
6. rails server -p $PORT -b 0.0.0.0

Copied from https://www.freecodecamp.org/news/painless-rails-development-environment-setup-with-docker/