Rails 6 API Development and GitHub Actions CI with Docker (docker-compose.yml)

docker-compose.yml

version: "3.7"

services:
  db:
    image: mysql:8.0.20
    command: --default-authentication-plugin=mysql_native_password
    environment:
      - MYSQL_ROOT_PASSWORD
      - MYSQL_ALLOW_EMPTY_PASSWORD
    volumes:
      - mysql-data:/var/lib/mysql
    ports:
      - ${MYSQL_FORWARDED_PORT:-3306}:3306
      - ${MYSQL_FORWARDED_X_PORT:-33060}:33060

  base: &base
    build:
      context: .
      dockerfile: ./Dockerfile
      cache_from:
        - rails6api-development-cache
      args:
        ARG_RUBY_VERSION: ${ARG_RUBY_VERSION:-2.7.1}
    image: rails6api-development:0.1.0
    tmpfs:
      - /tmp

  wait-middleware: &wait-middleware
    <<: *base
    environment:
      WAIT_HOSTS: db:3306
    depends_on:
      - db
    command: /wait

  backend: &backend
    <<: *base
    stdin_open: true
    tty: true
    volumes:
      - ./:/app:cached
      - ${GEMS_CACHE_DIR:-bundle-cache}:/bundle
      - rails-cache:/app/tmp/cache
    depends_on:
      - db

  console:
    <<: *backend
    ports:
      - 3333:3000
    command: /bin/bash

  server:
    <<: *backend
    ports:
      - 3333:3000
    command: bash -c "rm -f tmp/pids/server.pid && rails s -b 0.0.0.0"

volumes:
  mysql-data:
  bundle-cache:
  rails-cache: