func Register(name string, manager RepositoryManager) {
	if managers == nil {
		managers = make(map[string]RepositoryManager)
	}
	managers[name] = manager
}
func Register(name string, manager RepositoryManager) {
	if managers == nil {
		managers = make(map[string]RepositoryManager)
	}
	managers[name] = manager
}
// Register registers a new repository manager, that can be later configured
// and used.