Precompile assets locally for Capistrano deploy

deploy.rb

load 'deploy/assets'

namespace :deploy do
  namespace :assets do
    desc 'Run the precompile task locally and rsync with shared'
    task :precompile, :roles => :web, :except => { :no_release => true } do
      %x{bundle exec rake assets:precompile}
      %x{rsync --recursive --times --rsh=ssh --compress --human-readable --progress public/assets #{user}@#{host}:#{shared_path}}
      %x{bundle exec rake assets:clean}
    end
  end
end