Another one solution

.dockerdev/Aptfile

@@ -0,0 +1 @@
+vim

.dockerdev/Dockerfile

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+ARG RUBY_VERSION
+FROM ruby:$RUBY_VERSION
+
+ARG BUNDLER_VERSION
+ARG PG_MAJOR
+ARG NODE_MAJOR
+
+# Common dependencies
+RUN apt-get update -qq \
+  && DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends \
+    build-essential \
+    gnupg2 \
+    curl \
+    less \
+    git \
+  && apt-get clean \
+  && rm -rf /var/cache/apt/archives/* \
+  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
+  && truncate -s 0 /var/log/*log
+
+# Add PostgreSQL to sources list
+RUN curl -sSL https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add - \
+  && echo 'deb http://apt.postgresql.org/pub/repos/apt/ buster-pgdg main' $PG_MAJOR > /etc/apt/sources.list.d/pgdg.list
+
+
+# Add NodeJS to sources list
+RUN curl -sL https://deb.nodesource.com/setup_$NODE_MAJOR.x | bash -
+
+
+# Application dependencies
+# We use an external Aptfile for that, stay tuned
+COPY ./Aptfile /tmp/Aptfile
+RUN apt-get update -qq
+RUN DEBIAN_FRONTEND=noninteractive apt-get -yq dist-upgrade
+RUN DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends \
+    nodejs \
+    $(cat /tmp/Aptfile | xargs) && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* && \
+    truncate -s 0 /var/log/*log
+
+# Configure bundler
+ENV LANG=C.UTF-8 \
+  BUNDLE_JOBS=4 \
+  BUNDLE_RETRY=3
+
+# Uncomment this line if you store Bundler settings in the project's root
+# ENV BUNDLE_APP_CONFIG=.bundle
+
+# Uncomment this line if you want to run binstubs without prefixing with `bin/` or `bundle exec`
+# ENV PATH /app/bin:$PATH
+
+# Upgrade RubyGems and install required Bundler version
+RUN gem update --system && \
+    gem install bundler:$BUNDLER_VERSION
+
+# Create a directory for the app code
+RUN mkdir -p /app
+
+WORKDIR /app

.dockerdev/env/database

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+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=supersecure

.dockerdev/env/web

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+DATABASE_HOST=database

.gitignore

@@ -2,7 +2,6 @@
 *.sassc
 .sass-cache
 capybara-*.html
-.rspec
 /.bundle
 /vendor/bundle
 /log/*
@@ -13,4 +12,23 @@ capybara-*.html
 /spec/tmp/*
 **.orig
 rerun.txt
-pickle-email-*.html
+pickle-email-*.html
+
+# Rails stuff
+/source/.bundle
+/source/vendor/bundle/
+/source/doc
+/source/log/*
+/source/tmp
+
+# various artifacts
+**.war
+/source/public/cache
+/source/public/stylesheets/compiled
+/source/public/uploads
+/source/public/system
+/source/spec/tmp/*
+/source/cache
+
+# Mac finder artifacts
+.DS_Store

docker-compose.yml

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+version: '3.7'
+
+volumes:
+  db_data:
+  gem_cache:
+
+services:
+  web:
+    build:
+      context: .dockerdev
+      dockerfile: Dockerfile
+      args:
+        RUBY_VERSION: '2.3.8'
+        PG_MAJOR: '11'
+        NODE_MAJOR: '10'
+        BUNDLER_VERSION: '1.17.3'
+    command: bundle exec rails server -b 0.0.0.0
+    ports:
+      - "3000:3000"
+    volumes:
+      - ./source:/app
+      - gem_cache:/usr/local/bundle
+    env_file:
+      - .dockerdev/env/web
+      - .dockerdev/env/database
+    depends_on:
+      - database
+      # - redis
+    tty: true
+    stdin_open: true
+    tmpfs:
+      - /tmp
+
+  database:
+    image: postgres:11
+    env_file:
+      - .dockerdev/env/database
+    volumes:
+      - db_data:/var/lib/postgresql/data
+
+  # redis:
+  #   image: redis:5.0

source/.rspec

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+--format documentation

source/Gemfile

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+source 'https://rubygems.org'
+
+ruby '2.3.8'
+
+# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
+gem 'rails', '4.2.11.3'
+# Use postgresql as the database for Active Record
+gem 'pg', '~> 0.15'
+# Use SCSS for stylesheets
+gem 'sass-rails', '~> 5.0'
+# Use Uglifier as compressor for JavaScript assets
+gem 'uglifier', '>= 1.3.0'
+# Use CoffeeScript for .coffee assets and views
+gem 'coffee-rails', '~> 4.1.0'
+# See https://github.com/rails/execjs#readme for more supported runtimes
+# gem 'therubyracer', platforms: :ruby
+
+# Use jquery as the JavaScript library
+gem 'jquery-rails'
+# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
+gem 'turbolinks'
+# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
+gem 'jbuilder', '~> 2.0'
+# bundle exec rake doc:rails generates the API under doc/api.
+gem 'sdoc', '~> 0.4.0', group: :doc
+
+# Use ActiveModel has_secure_password
+# gem 'bcrypt', '~> 3.1.7'
+
+# Use Unicorn as the app server
+# gem 'unicorn'
+
+# Use Capistrano for deployment
+# gem 'capistrano-rails', group: :development
+
+group :development, :test do
+  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
+  gem 'byebug'
+  gem 'rspec-rails', '~> 4.1.0'
+  gem 'pry-byebug'
+end
+
+group :development do
+  gem 'web-console', '~> 2.0'
+  gem 'spring'
+end
+
+group :test do
+  gem 'capybara'
+end