Upgrade Alpine Linux without upgrading certain packages

I have "NextCloud" installed in the docker. Docker (downloaded from GitHub) is based on Alpine Linux. As you know, Linux used in docker is not complete. I'd like to do automatic update/upgrade from cron. However, I would not like the upgrade to be performed on NextCloud packages, because I intend to use (for various reasons) a tool built into Nextcloud itself for this purpose.
However, the "apk" command doesn't have the "--exclude" option. So how can I upgrade the system without doing it on all "nextcloud*" packages?