How can I add a volumeclaimtemplate with Helm ?

[guidodobboletta]

I'm deploying both gha-runner-scale-set-controller and gha-runner-scale-set using Helm and I'd like to add a volumeclaimtemplate to my runner pods to use for caching but I can't see a way to do it. The only way I found out how to do it was to use a RunnerSet resource but I'm deploying via Helm so I don't have that.