redhat: use variable galera_enable_mariadb_repo

[bufanda]

…epo use

Description

The variable galera_enable_mariadb_repo only omits configuration for mariadb repo in Debian. In environments with
limited access to the Internet and using RedHat Satellite to serve reopsitories this behaviour should also be available for RedHat configuration.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (non-breaking change that does not add functionality or fix an issue)

Checklist:

• I have read the CONTRIBUTING document.
• I have run the pre-merge tests locally and they pass.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[elcomtik]

What version of mariaDB is available through RedHat Satellite? This role is tested only against 10.6

[bufanda]

What version of mariaDB is available through RedHat Satellite? This role is tested only against 10.6

Satellite is like a repository mirror for systems without access to the internet with lifecycle management, so it is possible to serve the official mariadb repos but not with a direct link to the Internet. in RHEL8 the default Version is 10.2 or via AppStream 10.5. But we also use 10.6 as we serve the mariadb repos to our server. That said, we also use the role with 10.5 without issues. It's just the public repos we don't use and to allow us to use the internal repos this change we'd like to be upstream so we don't have to modify every time we update. It's more a convenience thing :)

[elcomtik]

Seems reasonable, I will aprove it for running tests

[elcomtik]

Please fix training whitespace lint error

[bufanda]

fixed.

[elcomtik]

CentOS 8 test are broken, so LGTM.