Add ErrFederationCertificateNotFound error (#9)

Author: icerzack

iamerrors/iamerrors.go

@@ -35,6 +35,7 @@ var (
 	ErrFederationIssuerRequired        = errors.New("FEDERATION_ISSUER_REQUIRED")
 	ErrFederationSSOURLRequired        = errors.New("FEDERATION_SSO_URL_REQUIRED")
 	ErrFederationCertificateIDRequired = errors.New("FEDERATION_CERTIFICATE_ID_REQUIRED")
+	ErrFederationCertificateNotFound   = errors.New("FEDERATION_CERTIFICATE_NOT_FOUND")
 	ErrFederationMaxAgeHoursRequired   = errors.New("FEDERATION_MAX_AGE_HOURS_REQUIRED")
 	ErrFederationNotFound              = errors.New("FEDERATION_NOT_FOUND")
 
@@ -82,6 +83,7 @@ var (
 		ErrFederationIssuerRequired.Error():        ErrFederationIssuerRequired,
 		ErrFederationSSOURLRequired.Error():        ErrFederationSSOURLRequired,
 		ErrFederationCertificateIDRequired.Error(): ErrFederationCertificateIDRequired,
+		ErrFederationCertificateNotFound.Error():   ErrFederationCertificateNotFound,
 		ErrFederationNotFound.Error():              ErrFederationNotFound,
 		ErrFederationMaxAgeHoursRequired.Error():   ErrFederationMaxAgeHoursRequired,
 		ErrUserOrGroupNotFound.Error():             ErrUserOrGroupNotFound,