capistrano-git-submodule-strategy
Git submodule support for Capistrano 3
Capfile
require 'capistrano/git-submodule-strategy'
Gemfile
gem 'capistrano-git-submodule-strategy', '~> 0.1', :github => 'i-ekho/capistrano-git-submodule-strategy'
deploy.rb
set :scm, :git
set :git_strategy, Capistrano::Git::SubmoduleStrategy