Rails Docker

docker-compose.yml

version: "3"
services:
  app:
    build: .
    command: bundle exec rails s -p 3001 -b '0.0.0.0'
    environment:
      RAILS_ENV: development
    volumes:
      - .:/workspace
    ports:
      - "3001:3001"

Dockerfile

FROM ruby:2.5.1

ENV LANG C.UTF-8

RUN apt-get update -qq && apt-get install -y build-essential mysql-client
RUN mkdir /workspace
WORKDIR /workspace
ADD Gemfile /workspace/Gemfile
ADD Gemfile.lock /workspace/Gemfile.lock
RUN bundle install
ADD . /workspace