Secret create - add ignore option to allow noop

Signed-off-by: Ygal Blum <ygal.blum@gmail.com>

pkg/domain/entities/secrets.go

@@ -12,6 +12,7 @@ type SecretCreateOptions struct {
 	DriverOpts map[string]string
 	Labels     map[string]string
 	Replace    bool
+	Ignore     bool
 }
 
 type SecretInspectOptions struct {