Dockerize this project

Use a compose file so we can integrate a database and a jenkins server
so we have a completely put together development environment

Dockerfile

@@ -0,0 +1,25 @@
+FROM ruby:2.3
+
+RUN touch /etc/app-env
+
+RUN sed -i '/jessie-updates/d' /etc/apt/sources.list
+
+RUN apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 5072E1F5 && \
+    echo "deb http://repo.mysql.com/apt/debian/ jessie mysql-5.7" > /etc/apt/sources.list.d/mysql.list && \
+    apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs libmysqlclient-dev mysql-client
+
+WORKDIR /app
+
+COPY Gemfile /app
+COPY Rakefile /app
+COPY bin /app/bin
+COPY config.ru /app
+COPY janky.gemspec /app
+COPY lib /app/lib
+COPY script /app/script
+COPY test /app/test
+
+RUN bundle install --binstubs
+RUN mkdir /app/log
+
+EXPOSE 9393

docker-compose.yml

@@ -0,0 +1,32 @@
+version: '3.6'
+services:
+  db:
+    image: mysql:5.7
+    command: --sql_mode="NO_ENGINE_SUBSTITUTION"
+    environment:
+      MYSQL_ALLOW_EMPTY_PASSWORD: 1
+    volumes:
+       - "db-data:/var/lib/mysql"
+  jenkins:
+    image: mattrdash/jenkins-for-janky:lts
+    volumes:
+      - "jenkins-data:/var/jenkins_home"
+  app:
+    build:
+      context: .
+    image: janky-app
+    command: 'script/server'
+    environment:
+      - RACK_ENV
+      - RACK_ROOT
+      - JANKY_BASE_URL
+    volumes:
+      - "${VOLUME:-.:/app}"
+    ports:
+      - "9393:9393"
+    depends_on:
+      - db
+      - jenkins
+volumes:
+  db-data:
+  jenkins-data:

lib/janky.rb

@@ -89,7 +89,7 @@ def self.setup(settings)
     end
 
     if env != "production"
-      settings["DATABASE_URL"] ||= "mysql2://root@localhost/janky_#{env}"
+      settings["DATABASE_URL"] ||= "mysql2://root@db/janky_#{env}"
       settings["JANKY_BASE_URL"] ||= "http://localhost:9393/"
       settings["JANKY_BUILDER_DEFAULT"] ||= "http://localhost:8080/"
       settings["JANKY_CONFIG_DIR"] ||= File.dirname(__FILE__)