How to skip including the asset host when precompiling assets, which is pretty important if you use Heroku pipelines and your CDN is different between stages!

assets.rake

namespace :assets do
  
  desc "Unsets the asset host, so it's not included in JS and CSS asset urls during precompile."
  task :unset_asset_host => :environment do
    ActionController::Base.asset_host = ""
  end
  
  Rake::Task["assets:precompile"].enhance(["assets:unset_asset_host"])
end