Enable server-side hooks (global)

Summary

I'd like to enable server-side hooks for my gitlab deployment. I've found the standard CE documentation here https://docs.gitlab.com/ee/administration/custom_hooks.html but am having trouble working out how I might be able to do the equivalent in my helm deployment

I'm imagining I can create a configmap or secret (eg called pre-receive-hooks) containing the hook scripts, and then mount this as a volume to the required location - eg /home/git/gitlab-shell/hooks/pre-receive.d/. Struggling to confirm which pods, and to what location though.

Can anyone help? Is this possible?