Is your feature request related to a problem?
Kaniko must be run as root. This is a problem in security aware environments.

Which solution do you suggest?
Possibility to run kaniko builder in it's own user namespace, which is enabled by default since Kubernetes v1.33.
This requires to set hostUsers: false in the PodSpec.

Which alternative solutions exist?
None that I am aware of.

Additional context
Kubernetes Blog - Kubernetes v1.33: User Namespaces enabled by default!
Linux user namespaces