putFiles method
Copies files into the container id (created or running), the
parent directories included: they are written as a tar archive and
unpacked at the root.
Implementation
Future<void> putFiles(String id, List<TarFile> files) async {
await _drain(
await _send(
'PUT',
'/containers/$id/archive',
query: {'path': '/'},
body: tarArchive(files),
contentType: 'application/x-tar',
),
);
}