Fix baseurl for centos stream chroot

[schlupov]

= changelog =
msg: dnf copr enable on CentOS Stream should enable centos stream chroot, not epel 8
type: bugfix
resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1994154

[xsuchy]

LGTM

[hlovdal]

When is this fix getting released? This was fixed more than 8 months ago but I still get this error today on a fully updated centos stream 8 system:

$ dnf copr -v enable hlovdal/nebula-overlay-networking 
Loaded plugins: builddep, changelog, config-manager, copr, debug, debuginfo-install, download, etckeeper, generate_completion_cache, groups-manager, kpatch, needs-restarting, playground, repoclosure, repodiff, repograph, repomanage, reposync
DNF version: 4.7.0
cachedir: /var/cache/dnf
Enabling a Copr repository. Please note that this repository is not part
of the main distribution, and quality may vary.

The Fedora Project does not exercise any power over the contents of
this repository beyond the rules outlined in the Copr FAQ at
<https://docs.pagure.org/copr.copr/user_documentation.html#what-i-can-build-in-copr>,
and packages are not held to any quality or security level.

Please do not file bug reports about these packages in Fedora
Bugzilla. In case of problems, contact the owner of this repository.

Do you really want to enable copr.fedorainfracloud.org/hlovdal/nebula-overlay-networking? [y/N]: y
Error: This repository does not have any builds yet so you cannot enable it now.
$