[RadiozRadioz]

If you're the one building the image, rebuild with newer versions of constituent software and re-create. If you're pulling the image from a public repository (or use a dynamic tag), bump the version number you're pulling and re-create. Several automations exist for both, if you're into automatic updates.

To me, that workflow is no more arduous than what one would do with apt/rpm - rebuild package & install, or just install.

How does one do it on nix? Bump version in a config and install? Seems similar

[mixedCase]

Now do that for 30 services and system config such as firewall, routing if you do that, DNS, and so on and so forth. Nix is a one stop shop to have everything done right, declaratively, and with an easy lock file, unlike Docker.

Doing all that with containers is a spaghetti soup of custom scripts.