Rails 6, ruby 2.7 Docker for Development

docker-compose.yml

version: '3'
services:
  redis:
    image: redis
  db:
    image: postgres
    ports:
      - 5432
    volumes:
      - ./postgres-data:/var/lib/postgresql/data:rw
    environment:
      POSTGRES_USER: root
      POSTGRES_PASSWORD: mysecretpassword
  web:
    build: .
    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    volumes:
      - .:/app
      - ./bundle-path:/bundle
    ports:
      - "3000:3000"
    depends_on:
      - db
      - redis
    environment:
       REDIS_URL: redis://redis:6379/12
       BUNDLE_PATH: /bundle/vendor
       EDITOR: vi #for credentials editing
       WEBPACKER_DEV_SERVER_HOST: webpacker
  sidekiq:
    build: .
    command: bundle exec sidekiq
    environment:
      REDIS_URL: redis://redis:6379/12
      BUNDLE_PATH: /bundle/vendor
    depends_on:
      - db
      - redis
    volumes:
      - .:/app
      - ./bundle-path:/bundle
  webpacker:
    build: .
    environment:
      - NODE_ENV=development
      - RAILS_ENV=development
      - WEBPACKER_DEV_SERVER_HOST=0.0.0.0
    command: ./bin/webpack-dev-server
    volumes:
      - .:/app
    ports:
      - '3035:3035'

volumes:
  bundle-path:
  postgres-data:
  # redis data doesn't need to persist right now

Dockerfile

FROM ruby:2.7
RUN apt-get update && apt-get install -y \
  curl \
  build-essential \
  libpq-dev &&\
  curl -sL https://deb.nodesource.com/setup_10.x | bash - && \
  curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
  echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list && \
  apt-get update && apt-get install -y nodejs yarn vim

RUN mkdir /app
WORKDIR /app
COPY Gemfile /app/Gemfile
COPY Gemfile.lock /app/Gemfile.lock
COPY package.json /app/package.json
COPY yarn.lock /app/yarn.lock
RUN bundle install
RUN yarn install --check-files
COPY . /app

# Add a script to be executed every time the container starts.
#COPY entrypoint.sh /usr/bin/
#RUN chmod +x /usr/bin/entrypoint.sh
#ENTRYPOINT ["entrypoint.sh"]
EXPOSE 3000

# Start the main process.
CMD ["rails", "server", "-b", "0.0.0.0"]