cilium-operator.Dockerfile: set `klog` logging values from cilium-operator
cilium-operator.Dockerfile: set `klog` logging values from cilium-operator

`klog`, which is used by the Kubernetes libraries consumed by `cilium-operator`,
always tries to log to a file in `/tmp`. Since the `cilium-operator` container
image is built off of `scratch`, such a directory does not exist. If the
directory does not exist, `klog` exits and causes `cilium-operator` to crash.
To not crash, do not log to any directories, and instead set the `logtostderr`
value within `klog` to `true` so that it does not log to a directory.

Fixes: #7006

Signed-off by: Ian Vernon <ian@cilium.io>

cilium/cilium,cilium/cilium,tgraf/cilium,cilium/cilium,michi-covalent/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,michi-covalent/cilium,michi-covalent/cilium,michi-covalent/cilium,tgraf/cilium,cilium-team/cilium,tklauser/cilium,tklauser/cilium,cilium/cilium,tklauser/cilium,cilium-team/cilium,tgraf/cilium,tklauser/cilium,cilium/cilium,tgraf/cilium,michi-covalent/cilium