How to configure tls_ca_cert on Helm deployed runner

We’re having issues with jobs failing in our pipelines intermittently with SSL cert errors. We have the cert to provide the Runner, however, I’m not sure what the best way to go about this is. Currently I am mounting the cert from a secret into ~/.gitlab-runner/certs/my-domain.crt.

Can I specify this in the [runner] config.toml? Can I also somehow influence how gitlab-runner artifact-uploader also adds this to the list of arguments when it runs?

Running on v16.4.1-ee