CentOS Stream 9
sudo curl -fsSL https://repo.oldium.net/deb/archive-keyring.asc -o /etc/pki/rpm-gpg/RPM-GPG-KEY-repo-oldium-net
sudo tee /etc/yum.repos.d/repo-oldium-net.repo >/dev/null <<'EOF'
[repo-oldium-net]
name=Repository repo.oldium.net
baseurl=https://repo.oldium.net/rpm/centos/9
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-repo-oldium-net
EOF
sudo rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-repo-oldium-net && \
sudo dnf -q makecache -y --disablerepo='*' --enablerepo=repo-oldium-net