Hey with this guide and repository you should be able to build a Rails application on docker but also using redis, foreman, webpack dev server and also imagemagick(currently only avaiblable on ruby alpine dockerfile)

use this repository for the base on the docker rails development and production rails app dockerize

Base directory is for guidance on building your docker files

Copy all the files in base directory to your future rails app directory

For development:

commands:

create new rails app

docker-compose run --no-deps web rails new . --force --database=postgresql

change permissions

sudo chown -R $USER:$USER .

now we need to do some changes on our rails application

in config/database.yml

add this lines under encoding

host: <%= ENV["DATABASE_HOST"] %>
username: <%= ENV["DATABASE_USERNAME"] %>
password: <%= ENV["DATABASE_PASSWORD] ">

add gems to Gemfile

foreman
sidekiq
redis

rebuild app with

docker-compose build web

create database

docker-compose run --rm web rails db:create db:migrate

finally brings up your rails app

docker-compose up --build web

For Production:

Commands:

we need to set production database.yml to our default conf or use a configuration of your preference

production:
  <<: *default
database: myapp_production

we need to build de production image of our application

docker-compose -f docker-compose.prod.yml build #you can also build both separate 

now its time to get all of our services up

docker-compose -f docker-compose.prod.yml up -d  

time get up our services

docker-compose -f docker-compose.prod.yml up -d --build #also you should skip -d flag to get logs of your container 

disclaimer: you can rename each file as your preferences