Configure initial Rails + Docker + Docker-compose

Create Rails + Docker + Docker-compose

## Guide docker compose install
https://docs.docker.com/compose/install/

## Command initial
docker run -it --rm --user "$(id -u):$(id -g)" -v "$PWD":/usr/src/app -w /usr/src/app rails rails new --skip-bundle my_app --database=postgresql

## Create Dockerfile
FROM ruby:2.5.3
# Instala as nossas dependencias
RUN apt-get update && apt-get install -qq -y --no-install-recommends \
      build-essential nodejs libpq-dev
# Seta nosso path
ENV INSTALL_PATH /usr/src/app
# Cria nosso diretório
RUN mkdir -p $INSTALL_PATH
# Seta o nosso path como o diretório principal
WORKDIR $INSTALL_PATH
# Copia o nosso Gemfile para dentro do container
COPY Gemfile ./
# Instala as Gems
RUN bundle install
# Copia nosso código para dentro do container
COPY . .
# Roda nosso servidor
CMD puma -C config/puma.rb

# create docker-compose.yml
version: '2'

services:
  postgres:
    image: 'postgres:9.5'
    volumes:
      - 'postgres:/var/lib/postgresql/data'

  website:
    depends_on:
      - 'postgres'
    build: .
    ports:
      - '3000:3000'
    volumes:
      - '.:/usr/src/app'

volumes:
  postgres:

## Run build
docker-compose build

## Configure config/database.yml
default: &default
  adapter: postgresql
  encoding: unicode
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  host: postgres
  user: postgres

development:
  <<: *default
  database: my_app_development

test:
  <<: *default
  database: my_app_test

production:
  <<: *default
  database: my_app_production