create-react-app with capistrano for automated deployments

Capfile

require "capistrano/setup"
require "capistrano/deploy"
require "capistrano/scm/git"
require 'capistrano/npm'
install_plugin Capistrano::SCM::Git
Dir.glob("lib/capistrano/tasks/*.rake").each { |r| import r }

deploy.rb

# config/deploy.rb

# config valid for current version and patch releases of Capistrano
lock "~> 3.10.2"

set :application, "app-name"
set :repo_url, "git@bitbucket.org:username/app-name.git"
set :ssh_options, { :forward_agent => true }
set :npm_flags, '--silent --no-progress'

namespace :deploy do
    desc 'Restart application'
    task :restart do
      invoke 'react:build'
    end   
end

after 'deploy:publishing', 'deploy:restart'

Gemfile

# frozen_string_literal: true
source "https://rubygems.org"

git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }

gem 'capistrano', '~> 3.10', '>= 3.10.2'
gem 'capistrano-npm'

react.rake

# lib/capistrano/tasks/react.rake
namespace :react do
  desc 'RUN NPM BUILD'
    task :build do
      on roles(:app) do
        execute "sh -c \"cd #{deploy_to}/current/ && #{fetch(:build_command)}\""
      end
  end
end
  

staging.rb

# config/deploy/staging.rb

set :branch,            'staging'
set :deploy_to,         'path_to_staging'

server 'your-server-ip-here', user: 'user', port: 22, roles: %w{web app db}

set :build_command, 'npm run build'