add Ruby on Rails 5 container

containers/ruby-2-rails-5/.devcontainer/Dockerfile

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+FROM debian:latest
+
+# Install vim, git, process tools
+RUN apt-get update \
+    && apt-get install -y \
+        vim \
+        git \
+        procps
+
+# Install ruby
+RUN apt-get install -y \
+        ruby \
+        ruby-dev \
+        build-essential \
+        libsqlite3-dev \
+        zlib1g-dev \
+        libxml2
+
+# Install nodejs
+RUN apt-get install -y \
+        nodejs
+
+# Install debug tools
+RUN gem install \
+        rake \
+        ruby-debug-ide \
+        debase
+
+# Install sinatra MVC components
+RUN gem install \
+        rails \
+        webdrivers
+
+# Clean up
+RUN apt-get autoremove -y \
+    && apt-get clean -y \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set the default shell to bash instead of sh
+ENV SHELL /bin/bash
+
+ENV PROJECT_NAME test-project

containers/ruby-2-rails-5/.devcontainer/devcontainer.json

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+{
+	"name": "Ruby 2 Rails",
+	"dockerFile": "Dockerfile",
+	"extensions": [
+		"rebornix.Ruby", 
+		"craigmaslowski.erb"
+	],
+	// Uncomment the next line if you want to publish any ports.
+	// "appPort": ["80:80"],
+
+	// Uncomment the next line to run commands after the container is created.
+	// "postCreateCommand": "cd ${input:projectName} && bundle install"
+}

containers/ruby-2-rails-5/.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Rails App",
+            "type": "Ruby",
+            "request": "launch",
+            // Current dir using env variable input in tasks.json
+            "cwd": "${workspaceRoot}/${env:PROJECT_NAME}", 
+            // run bundle install before rails server
+            "preLaunchTask": "bundleInstall",
+            "program": "bin/rails",
+            // Setup debug binding IP and port.
+            "args": ["s", "-b", "0.0.0.0", "-p", "80"], 
+        }
+    ]
+}

containers/ruby-2-rails-5/.vscode/tasks.json

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+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {   // 2. bundle install in project folder
+            "label": "bundleInstall",
+            "dependsOn": "setEnv",      // sequential
+            "type": "shell",
+            "command": "cd ${env:PROJECT_NAME} && bundle install"
+        }, 
+        {   // 1. input project name and set as env variable, the only way 
+            // to share it to launch.json. You can also hard code it.
+            "label": "setEnv",
+            "type": "shell",
+            "command": "export PROJECT_NAME=${input:projectName}"
+        }
+    ], 
+    "inputs": [
+        {   // prompt user to input project name for debugging
+            "type": "promptString",
+            "id": "projectName",
+            "description": "Please input the name of the project to debug.",
+            "default": "test-project"
+        }
+    ]
+}

containers/ruby-2-rails-5/README.md

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+# Ruby 2 Rails 5
+
+## Summary
+
+*Develop Ruby on Rails 5 applications, includes everything you need to get up and running.*
+
+| Metadata | Value |  
+|----------|-------|
+| *Contributors* | The VS Code Team, [Amblizer][la] |
+| *Definition type* | Dockerfile |
+| *Languages, platforms* | Ruby |
+
+## Using this definition with an existing folder
+
+This definition does not require any special steps to use. Just follow these steps:
+
+1. If this is your first time using a development container, please follow the [getting started steps](https://aka.ms/vscode-remote/containers/getting-started) to set up your machine.
+
+2. To start then:
+   1. Start VS Code and open your project folder.
+   2. Press <kbd>F1</kbd> select and **Remote-Containers: Create Container Configuration File...** from the command palette.
+   3. Select the Ruby 2 rails 5 definition.
+
+3. To use latest-and-greatest copy of this definition from the repository:
+   1. Clone this repository.
+   2. Copy the contents of `.devcontainer` and `.vscode` fodlers under `containers/ruby-2-rails-5/` to the root of your project folder.
+   3. Start VS Code and open your project folder.
+
+4. After following step 2 or 3, the contents of the `.devcontainer` folder in your project can be adapted to meet your needs.
+
+5. Finally, press <kbd>F1</kbd> and run **Remote-Containers: Reopen Folder in Container** to start using the definition.
+
+## Testing the definition
+
+This definition includes some test code that will help you verify it is working as expected on your system. Follow these steps:
+
+1. If this is your first time using a development container, please follow the [getting started steps](https://aka.ms/vscode-remote/containers/getting-started) to set up your machine.
+2. Clone this repository.
+3. Start VS Code, press <kbd>F1</kbd>, and select **Remote-Containers: Open Folder in Container...**
+4. Select the `containers/ruby-2-rails-5` folder.
+5. After the folder has opened in the container, press <kbd>F5</kbd> to start the project. Enter the name of the project to debug at popup input bar (it is populated for the test-project).
+6. You should see "* Listening on tcp://0.0.0.0:80" in the Debug Console. press <kbd>F1</kbd>. Select **Remote-Containers: Forward Porrt From Container...** then choose **Forward 80**,  and by browsing http://localhost/ you should see "Yay! You’re on Rails!".
+7. From here, you can add breakpoints or edit the contents of the `test-project` folder to do further testing.
+
+## License
+
+Copyright (c) Microsoft Corporation. All rights reserved.
+
+Licensed under the MIT License. See [LICENSE](https://github.com/Microsoft/vscode-dev-containers/blob/master/LICENSE).
+
+<!-- links -->
+[la]: https://code.mzhao.page/

containers/ruby-2-rails-5/test-project/.gitignore

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+# See https://help.github.com/articles/ignoring-files for more about ignoring files.
+#
+# If you find yourself ignoring temporary files generated by your text editor
+# or operating system, you probably want to add a global ignore instead:
+#   git config --global core.excludesfile '~/.gitignore_global'
+
+# Ignore bundler config.
+/.bundle
+
+# Ignore the default SQLite database.
+/db/*.sqlite3
+/db/*.sqlite3-journal
+
+# Ignore all logfiles and tempfiles.
+/log/*
+/tmp/*
+!/log/.keep
+!/tmp/.keep
+
+# Ignore uploaded files in development
+/storage/*
+!/storage/.keep
+
+/node_modules
+/yarn-error.log
+
+/public/assets
+.byebug_history
+
+# Ignore master key for decrypting credentials and more.
+/config/master.key

containers/ruby-2-rails-5/test-project/.ruby-version

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+ruby-2.3.3

containers/ruby-2-rails-5/test-project/Gemfile

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+source 'https://rubygems.org'
+git_source(:github) { |repo| "https://github.com/#{repo}.git" }
+
+ruby '2.3.3'
+
+# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
+gem 'rails', '~> 5.2.3'
+# Use sqlite3 as the database for Active Record
+gem 'sqlite3'
+# Use Puma as the app server
+gem 'puma', '~> 3.11'
+# Use SCSS for stylesheets
+gem 'sass-rails', '~> 5.0'
+# Use Uglifier as compressor for JavaScript assets
+gem 'uglifier', '>= 1.3.0'
+# See https://github.com/rails/execjs#readme for more supported runtimes
+# gem 'mini_racer', platforms: :ruby
+
+# Use CoffeeScript for .coffee assets and views
+gem 'coffee-rails', '~> 4.2'
+# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
+gem 'turbolinks', '~> 5'
+# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
+gem 'jbuilder', '~> 2.5'
+# Use Redis adapter to run Action Cable in production
+# gem 'redis', '~> 4.0'
+# Use ActiveModel has_secure_password
+# gem 'bcrypt', '~> 3.1.7'
+
+# Use ActiveStorage variant
+# gem 'mini_magick', '~> 4.8'
+
+# Use Capistrano for deployment
+# gem 'capistrano-rails', group: :development
+
+# Reduces boot times through caching; required in config/boot.rb
+gem 'bootsnap', '>= 1.1.0', require: false
+
+group :development, :test do
+  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
+  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
+end
+
+group :development do
+  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
+  gem 'web-console', '>= 3.3.0'
+  gem 'listen', '>= 3.0.5', '< 3.2'
+  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
+  gem 'spring'
+  gem 'spring-watcher-listen', '~> 2.0.0'
+end
+
+group :test do
+  # Adds support for Capybara system testing and selenium driver
+  gem 'capybara', '>= 2.15'
+  gem 'selenium-webdriver'
+  # Easy installation and use of chromedriver to run system tests with Chrome
+  gem 'chromedriver-helper'
+end
+
+# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
+gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]