CentOS Sream 9 pre-release chroots added to Fedora Copr

[Pavel Raiskup]

Hi all,

just for the info, we enabled the `centos-stream-9-x86_64` and
`centos-stream-9-aarch64` chroots in Fedora Copr.  Note that we build
directly from composes [1] without mirrors (some failures can expected),
and that the packages are not GPG-signed.  You have been warned :-)

The ppc64le doesn't seem to build on Power8 hardware we have [2], and
s390x has some troubles with qemu emulation [3].  So those architectures
are at least for now disabled.

[1] https://github.com/rpm-software-management/mock/pull/751
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1985364
[3] Fatal glibc error: CPU lacks VXE support (z14 or later required),
    https://download.copr-dev.fedorainfracloud.org/results/praiskup/ping/centos-...

Happy building!
Pavel