return "", err
	}
	marshalledJSON = append(marshalledJSON, "\n"...)

	return writeCNIConfig(ctx, marshalledJSON, cfg)
}

// writeCNIConfig will
// 1. read in the existing CNI config file
// 2. append the `istio`-specific entry
// 3. write the combined result back out to the same path, overwriting the original.
func writeCNIConfig(ctx context.Context, pluginConfig []byte, cfg *config.InstallConfig) (string, error) {