Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
99.86.229.6)
Error: Failed to download metadata for repo 'https_download_copr_fedorainfracloud_org_results_plautrba_selinux_fedora_fedora_releasever_basearch': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried
ERROR: Exception(/var/lib/copr-rpmbuild/workspace/workdir-x79ufehf/policycoreutils/policycoreutils.spec) Config(fedora-rawhide-x86_64) 0 minutes 25 seconds
INFO: Results and/or logs in: /var/lib/copr-rpmbuild/results
INFO: Cleaning up build root ('cleanup_on_failure=True')
Start: clean chroot
Finish: clean chroot
ERROR: Command failed: 
 # /usr/bin/systemd-nspawn -q -M 30
But since DNF (called by Mock in the background) doesn't see the repository (error 404), it seems that the repository was not specified properly.

Namely, in this case, we are building for `fedora-rawhide-repository` but the repo was specified for `fedora-40-repository`.  Rawhide, at the time of build, was really F40, but Copr doesn't know how to expand `$releasever` to `rawhide`.