Add Dockerfile to project

.dockerignore

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+.env
+.env.test
+.git
+.rubocop.yml
+.travis.yml
+log/*

Dockerfile

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+FROM ruby:2.0.0-p643
+
+# Install deps
+RUN apt-get update \
+  && apt-get install -y libreadline-dev nano vim \
+  && apt-get purge -y --auto-remove
+
+# Ensure Gemfile.lock is up to date
+RUN bundle config --global frozen 1
+
+# Install latest released Napa to get baseline dependencies
+RUN gem install napa
+
+# Add a simple Procfile parser
+ADD contrib/start.rb /start
+
+# Create directory for app
+RUN mkdir -p /usr/src/app
+WORKDIR /usr/src/app
+
+# Copy Gemfile and Gemfile.lock and run bundle install
+ONBUILD COPY Gemfile /usr/src/app/
+ONBUILD COPY Gemfile.lock /usr/src/app/
+ONBUILD RUN bundle install
+
+# Copy rest of app
+ONBUILD COPY . /usr/src/app
+
+CMD ["/start", "web"]

contrib/start.rb

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+#!/usr/local/bin/ruby
+
+require 'yaml'
+
+# attempt to parse Procfile
+begin
+  proc = YAML.load_file('Procfile')
+  command = proc[ARGV[0]]
+
+  if command
+    exec(command)
+  else
+    puts "Could not find #{ARGV[0]} in Procfile"
+    exit 1
+  end
+rescue
+  puts 'Failed to parse Procfile'
+  exit 2
+end