Enter the mariadb instance:
runagent -m mariadb1
Create a config file my.cnf using nano…
podman unshare nano $(podman volume inspect mysql-conf.d --format={{.Mountpoint}})/my.cnf
…and add following content: (adapt to your needs)
[mysqld]
ft_min_word_len = 3
Restart mariadb service/container:
systemctl --user restart mariadb-app
Now the variable should be set as configured.