K8S Runner CA bundle for git clone?

I don’t want to use skip_verify: true in all my pipelines for git clone so I need a way to provide a custom CA bundle to the container running git clone.

After reviewing the documentation for the Kubernetes Runner I think the environment variable DRONE_RUNNER_DEVICES might be what I am looking for, however the documentation seems incomplete? The documentation only says that the given devices will be mounted into every pipeline step, but how do I define the mount path for each device? The example value of DRONE_RUNNER_DEVICES is just /dev/sdb with no mount path.