code: func (s *LocalStore) AddTLSChallenge(domain string, cert *Certificate) error {
  	s.lock.Lock()
  	defer s.lock.Unlock()
  
  	if s.storedData.TLSChallenges == nil {
  		s.storedData.TLSChallenges = make(map[string]*Certificate)
  	}
  
  	s.storedData.TLSChallenges[domain] = cert
  	return nil
  }
docs: // AddTLSChallenge Add a certificate to the ACME TLS-ALPN-01 certificates storage