It is a plugin for capistrano scm to deploy static sites.
gem 'capistrano-scm-static', '~> 0.0.2', require: false
require 'capistrano/scm/static'
install_plugin Capistrano::SCM::Static
set :dist, 'path to your static template compilation folder'
For eg,
set :dist, 'build' # in case for reactjs
set :dist, 'dist' # in case for vuejs