Chef recipe for using private gem repositories in github, from engineyard appcloud

default.rb

#
# Cookbook Name:: github_key
# Recipe:: default
#

ey_cloud_report "github_key" do
  message "Running Custom Github SSH Key Chef Configuration"
end

# loop over all application instances

node[:applications].each do |app_name,data|
  user = node[:users].first

  identity = "/home/deploy/.ssh/#{app_name}-deploy-key"
  puts identity

  case node[:instance_role]
  when "solo", "app", "app_master"
    template "/root/.ssh/config" do
      source "sshconfig.erb"
      owner "root"
      group "root"
      mode 0744
      variables({
        :identity => identity
      })
    end

    template "/home/deploy/.ssh/config" do
      source "sshconfig.erb"
      owner "deploy"
      group "deploy"
      mode 0744
      variables({
        :identity => identity
      })
    end
  end
end

sshconfig.erb

Host github.com
	User git
	Hostname github.com
	PreferredAuthentications publickey
	IdentityFile <%= @identity %>