Capistrano Deployment By Semantic Version Tag In Git https://ryanburnette.com/blog/capistrano-deployment-by-tag

deploy.rb

# deploy.rb
set :branch, Proc.new {
  tags = `git tag`.split("\n")
  vers = {}

  tags.each do |t|
    v = t.gsub('v','')
    vers[v] = t
  end

  sorted_vers = vers.keys.sort { |x,y| Gem::Version.new(x) <=> Gem::Version.new(y) }

  vers[sorted_vers.last]
}