How to get Padrino, Compass and Heroku working without checking in the resulting css to the git repo

gistfile1.txt

# Enables support for Compass, a stylesheet authoring framework based on SASS.
# See http://compass-style.org/ for more details.
# Store Compass/SASS files (by default) within 'app/stylesheets'

module CompassInitializer
  def self.registered(app)
    require 'sass/plugin/rack'

    Compass.configuration do |config|
      config.project_path = Padrino.root
      config.sass_dir = "app/stylesheets"
      config.project_type = :stand_alone
      config.http_path = "/"
      config.css_dir = "tmp/stylesheets" # we need to render to tmp
      config.images_dir = "public/images"
      config.javascripts_dir = "public/javascripts"
      config.output_style = :compressed
    end

    Compass.configure_sass_plugin!
    Compass.handle_configuration_change!

    app.use Sass::Plugin::Rack
    
    # then use Rack::Static to handle any requests for stylesheets and respond with the files rendered to tmp
    require "fileutils"
    FileUtils.mkdir_p(Padrino.root + "/tmp/stylesheets")
    app.use Rack::Static, :root => "tmp/", :urls => ["/stylesheets"]
    
  end
end