deploy.rb

// ...

namespace :deploy do
    task :upload_assets, :roles => :web do
        capifony_pretty_print "--> Uploading compiled assets"

        run_locally "gulp build --production --disable-fail"
        run "mkdir -p #{release_path}/#{assets_folder}"
        top.upload assets_folder, "#{release_path}/#{web_path}".to_s, {:via => :scp, :recursive => true}

        capifony_puts_ok
    end
end

# Set the task to upload compiled assets before the composer install
before "symfony:composer:install", "deploy:upload_assets"