Currently fails with:
```
Error from server (Forbidden): pods is forbidden: User "system:serviceaccount:default:hello-kairos" cannot list resource "pods" in API group "" at the cluster scope
```
because we try to list pods with `-A`. This means we are going to get a
similar error if we try to copy files to a Pod on another namespace
unless we grant permission at the cluster scope or just that
namespace. (Is that possible? Maybe if we create the Role in the same
namespace as the server.)
Signed-off-by: Dimitris Karakasilis <dimitris@karakasilis.me>
