allow passing --as argument to kubectl to impersonate (ex: get elevated permissions)

[bmm-alc]

While administration config of my cluster gives us a limited access by default, and require us to pass --as cluster-admin to kubectl to grant admin permissions.
Without this I cannot attach

(⎈|k8s-practical-shamir:default)cheddar at ~/bin ❯ ./kafkactl attach                   
Error from server (Forbidden): pods is forbidden: User "oidc:me@mycompany.com" cannot create resource "pods" in API group "" in the namespace "foobar"
command "/home/me/bin/kubectl" exited with non-zero status

I modified the config file to add

binary: kubectl --as cluster-admin

but it does not work.