Ruby script to set temp_url_key for Rackspace Cloudfiles

set_temp_key.rb

require 'fog'
 
# Please replace these with the approprate values

RACKSPACE_USERNAME = ENV['RACKSPACE_USERNAME']
RACKSPACE_API_KEY = ENV['RACKSPACE_APIKEY']
RACKSPACE_TEMP_URL_KEY = ENV['RACKSPACE_CLOUDFILES_TEMPURL_KEY'] # Self generated random string used like an auth token
 
puts "Creating Storage Service"
 
begin
  service = Fog::Storage.new(
    :provider => 'rackspace',
    :rackspace_username => RACKSPACE_USERNAME,
    :rackspace_api_key => RACKSPACE_APIKEY,
    :rackspace_region => :ord
  )

  service.post_set_meta_temp_url_key(RACKSPACE_TEMP_URL_KEY)
  puts "X-Account-Meta-Temp-Url-Key successfully set to #{RACKSPACE_TEMP_URL_KEY}"
 
rescue => e
  puts "Unable to set X-Account-Meta-Temp-Url-Key - #{e.inspect}"
  puts e.backtrace
end

Hi, i'm currently working with rackspace cloudfiles and am trying to set a rackspace_temp_url_key. So I created a random key; but now sure where I can use or put this script? Does this script need to be in config/initializer dir?

Any help will be much appreciated.