code: def _get_signing_jwk_key_set(jwt_issuer):
      
      key_set = KEYS()
  
      # asymmetric keys
      signing_jwk_set = settings.JWT_AUTH.get('JWT_PUBLIC_SIGNING_JWK_SET')
      if signing_jwk_set:
          key_set.load_jwks(signing_jwk_set)
  
      # symmetric key
      key_set.add({'key': jwt_issuer['SECRET_KEY'], 'kty': 'oct'})
  
      return key_set
docs: Returns a JWK Keyset containing all active keys that are configured
      for verifying signatures.