capistrano 3 compile assets locally then rsync

deploy.rb

namespace :deploy
 namespace :assets do
    desc "precompile and sync assets to app servers"
    task :sync do
      on roles(:app), in: :parallel do |role|
        run_locally do
          execute "rsync -avr -e ssh ./public/assets/ #{role.username}@#{role.hostname}:#{release_path}/public/assets"
        end
      end
    end

    desc "Precompile assets locally and then rsync to deploy server"
    task :precompile do
      on primary(:app) do
        run_locally do
          with rails_env: :production do
            rake 'assets:precompile'
          end
        end
      end
    end

    task :cleanup do
      run_locally do
        rake 'assets:clobber'
      end
    end

    before "assets:sync", "assets:precompile"
    after "assets:sync", "assets:cleanup"
  end
end

missing
namespace deploy do

saved my day, thank you.