app: added helm tgz handle

vendor/github.com/go-openapi/swag/errors.go

@@ -0,0 +1,15 @@
+package swag
+
+type swagError string
+
+const (
+	// ErrYAML is an error raised by YAML utilities
+	ErrYAML swagError = "yaml error"
+
+	// ErrLoader is an error raised by the file loader utility
+	ErrLoader swagError = "loader error"
+)
+
+func (e swagError) Error() string {
+	return string(e)
+}