fix(ssh-ident): Add a guardfile for github pull

Signed-off-by: Jeremy MAURO <jeremy.mauro@gmail.com>

cookbooks/workstation/recipes/_ssh-ident.rb

@@ -14,6 +14,7 @@ git ssh_ident_repo do
   repository 'https://github.com/ccontavalli/ssh-ident'
   user username
   action :checkout
+  not_if { ::File.exists?(ssh_ident_repo) }
 end