Automatically create a tag of your repository when you deploy

capistrano-tag_release.rb

namespace :git do
  desc "Create a git tag of the current release"
  task :tag_release do
    ref = `git ls-remote #{repository} #{branch} | awk '{print $1}'`.chomp

    # ISO representation of the current time
    time = Time.now.utc.to_datetime.to_s
    time.gsub! /-|:/, ""
    time.gsub! /\+\d+$/, "Z"

    command = "git tag #{branch}-#{time} #{ref} && git push origin --tags"
    puts(command)
    system(command)
  end
end

after "deploy", "git:tag_release"