verify all system accounts are set

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

services/storage-users/pkg/config/parser/parse.go

@@ -47,5 +47,12 @@ func Validate(cfg *config.Config) error {
 			"the config/corresponding environment variable).",
 			"storage-users", defaults2.BaseConfigPath())
 	}
+
+	if cfg.ServiceAccount.ServiceAccountID == "" {
+		return shared.MissingServiceAccountID(cfg.Service.Name)
+	}
+	if cfg.ServiceAccount.ServiceAccountSecret == "" {
+		return shared.MissingServiceAccountSecret(cfg.Service.Name)
+	}
 	return nil
 }