Consider supporting eBPF support with a cli flag

[devantler]

Description

https://github.com/k3d-io/k3d/discussions/479#discussioncomment-4610454 https://sandstorm.de/de/blog/post/running-cilium-in-k3s-and-k3d-lightweight-kubernetes-on-mac-os-for-development.html

This might not be necessary if it can be configured in the K3d config file.