Fix centos-stream-9 container image build

[RazvanLiviuVarzaru]

I can't find why previous builds (January 2026) worked but now we need to enable the mariadb module.

bash-5.1# dnf module list mariadb
CentOS Stream 9 - AppStream
Name                                         Stream                                      Profiles                                                        Summary
mariadb                                      10.11                                       client, galera, server [d]                                      MariaDB Module
mariadb                                      11.8                                        client, galera, server [d]                                      MariaDB Module

dnf module enable mariadb:11.8 -y

bash-5.1# dnf repoquery --source mariadb-server
mariadb-11.8.5-1.module_el9+1304+6dbdc612.src.rpm

[RazvanLiviuVarzaru]

@grooverdan this is a hacky fix,
I can’t figure out what changed since the last successful build so I can address the problem at its source.

[grooverdan]

Was broken: https://github.com/MariaDB/buildbot/actions/runs/23232302531

Sure, hacky, but a mariadb-11.8 as a list of build dependencies is a good improvement regardless.