def push_github()
  Thread.start do
    @repo = Rugged::Repository.new('/path/to/dir')

    logger.info 'Pushing submodule...'
    remote = @repo.remotes["origin"]

    # callback_called = false
    # update_tips_cb =  proc { callback_called = true }
    # credentials = Rugged::Credentials::SshKey.new({
    #   username:   ENV["GIT_SSH_USER"],
    #   publickey:  ENV["GIT_SSH_PUBKEY"],
    #   privatekey: ENV["GIT_SSH_KEY"],
    #   passphrase: ENV["GIT_SSH_PASSPHASE"],
    #   })
    # credentials = ssh_key_credential()
    # credentials = Rugged::Credentials::UserPassword.new({username: ENV['USER'], password: ENV['PASS']})
    # credentials = Rugged::Credentials::UserPassword.new({
    #   username: ENV['GITHUB_USER'],
    #   password: ENV['GITHUB_PASSWORD']
    # })

    remote.push(['refs/heads/master'], {credentials: credentials, update_tips: update_tips_cb})
    logger.info 'Done'
  end
end