Add my id_rsa.pub to authorized_keys in Capistrano

deploy.rb

  task :add_my_key_to_authorized_keys do
    unless `cat "$HOME/.ssh/id_rsa.pub"`.empty?
      id_rsa_pub_path = `echo "$HOME/.ssh/id_rsa.pub"`.strip
      on roles(:all) do
        upload! id_rsa_pub_path, "/tmp/id_rsa.pub"
        execute 'cat /tmp/id_rsa.pub .ssh/authorized_keys | sort -u -o .ssh/authorized_keys'
        execute 'cat .ssh/authorized_keys'
      end
    end
  end
  before :starting, :add_my_key_to_authorized_keys