Blog API example (#377)

examples/apps/blog/schema/Gemfile

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+source 'https://rubygems.org'
+
+gem 'json', '> 2'	
+gem 'sequel'
+gem 'mysql2'

examples/apps/blog/schema/create.rb

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+require "sequel"
+
+DB = Sequel.connect("mysql2://docker.for.mac.localhost/blog?user=#{ENV['DB_USER']}&password=#{ENV['DB_PASS']}")
+
+# create a posts table
+DB.create_table :posts do
+  primary_key :id
+  String :title
+  String :body
+end

examples/apps/blog/schema/func.yaml

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+version: 0.0.2
+runtime: ruby
+entrypoint: ruby create.rb
+build_image: treeder/ruby-mysql
+run_image: treeder/ruby-mysql