The 10-containerd-net.conflist file generated from the conf_template should be written atomically so that partial writes are not visible to CNI plugins. Use the new consistentfile package to ensure this on Unix-like platforms such as Linux, FreeBSD, and Darwin. Fixes https://github.com/containerd/containerd/issues/8607 Signed-off-by: Samuel Karp <samuelkarp@google.com>