code: func (t *TokensClient) PostEdDSAAuth(ctx context.Context, token string,
  	sig *base64.Value) (*envelope.Token, error) {
  	authReq := authTokenEdDSARequest{Type: primitive.AuthToken, TokenSig: sig}
  	return t.postAuthWorker(ctx, token, &authReq)
  }
docs: // PostEdDSAAuth requests an auth token from the registry for the provided login
  // token value, and it's signature.