Nightly COPR builds are failing

[vashirov]

Issue Description

After update of COPR to F41 and DNF5, srpm generation no longer works:

dnf builddep -y --skip-broken --spec rpmbuild/SPECS/389-ds-base.spec --best --allowerasing --setopt=install_weak_deps=False
Unknown argument "builddep" for command "dnf5". Add "--help" for more information about the arguments.
It could be a command provided by a plugin, try: dnf5 install 'dnf5-command(builddep)'
make: *** [/mnt/workdir-n4au9w6_/389-ds-base/.copr/Makefile:8: srpm] Error 2

Instead of installing all build dependencies, we should install the ones required for srpm generation.