return nil, err
		}
	}
	defer func() {
		if err := file.Close(); err != nil {
			log.Errorf("failed to close %s: %s", filename, err)
		}
	}()
	return io.ReadAll(file)
}

func setupFileConfigdumpWriter(filename string, out io.Writer) (*configdump.ConfigWriter, error) {
	data, err := readFile(filename)
	if err != nil {
		return nil, err
	}
	return setupConfigdumpEnvoyConfigWriter(data, out)
}