Heroku infra for playground

.npmignore

@@ -4,6 +4,7 @@
 /node_modules/
 /lib/
 /pkg/
+/playground/
 /test/
 
 /Gemfile*

playground/Procfile

@@ -0,0 +1 @@
+web: bundle exec rackup -p $PORT

playground/app.rb

@@ -7,7 +7,7 @@
 require 'bundler/setup'
 require 'sinatra'
 
-require_relative '../src/ripper'
+require_relative 'ripper'
 
 class App < Sinatra::Base
   get '/' do
@@ -25,5 +25,3 @@ class App < Sinatra::Base
     end
   end
 end
-
-App.run!

playground/config.ru

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+require_relative 'app'
+
+run App

playground/deploy

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+diff src/ripper.rb playground/ripper.rb > /dev/null
+
+if [ $? -eq 1 ]; then
+  echo "playground/ripper.rb out of sync with src/ripper.rb"
+  exit 1
+fi
+
+git subtree push --prefix playground heroku master