How to do an RPM/repo install with MySQL (not Postgres)

Basically you run a normal Zammad installation like you did.
Technically you’ll then need to install a mysql server and client and adjust the database configuration (config/database.yml).
You can find a sample config here:

If you migrate an existing installation anyway, you technically don’t have to create and seed the db before. The import should do that for you. Heads up during restoration the database.yml is overwritten with the one from your backup!

If you struggle with dependencies Zammad sided, the source code installation may help you with hints. Not all those dependencies are required in a normal installation. Package installations by default come postgresql and mysql enabled.
https://docs.zammad.org/en/latest/install/source.html#prerequisites