Nextcloud is in EPEL 10. You’ll get updates along with the rest of the OS.
I have been using EPEL 9 Nextcloud for a good while and it’s been a smooth experience.
If you want specifically Docker, I would not choose an EL10 distro, really. I have been test driving AlmaLinux 10 and it’s pretty nice, but I would look elsewhere.
Incus has a great selection of images that are ready to go, plus gives scripted access to VMs (and LXC containers) very easily; after
incus launch
to create a VM,incus exec
can immediately run commands as root for provisioning.