I create LXC container and then just install apache2, php and mariadb by hand with apt, then I install nextcloud from sources.

You can try this tutorial as its very close to what I did: https://docs.nextcloud.com/server/latest/admin_manual/installation/example_ubuntu.html

Also not OP. I run nextcloud on 10th gen i3 on spinning rust and performance is good. I run it on LXC container though so without docker

389-ds with cockpit plugin for administration