How do you modify config.toml of gitlab runner deployed via gitlab UI kubernetes configuration

Thanks in advance,

My issue relates to setting up a persistent maven repository volume so my build do not have to retrieve dependencies remotely every CI run instance.

Problem:
I need to add a configuration to the config.toml file so it will mount the persistent volume when the pod is created. How can I make this change in such a way that when the pod is created (as a result of the deployment) it contains the addition I require.

Hey were you able to get this figured out? I am having the same issue. Frustrated since 18 hours.

Thanks!