Capistranoでdeploy前にgit pushするタスクを追加する

git_ssh.sh

#!/bin/sh
exec ssh -F keys/ssh_config "$@"

sync.rake

# lib/capistrano/tasks/sync.rake

namespace :sync do

  desc 'run synchronization remote repository'
  task :git do
    on roles(:all) do | host |
      # run command in local
      run_locally do
        # if you want ssh warapper
        with GIT_SSH: "keys/git_ssh.sh" do
          execute :git, :push, "#{host}", "release/*"
        end
      end
    end
  end
  before :deploy, :'sync:git'

end