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DevWorkspace empty creator annotation due blank UID for kubeadmin

See original GitHub issue

Is your task related to a problem? Please describe.

Currently, we can get creator set as an empty string to two cases: 1. A controller is configured not to set up webhooks and as result, a creator annotation is not set during workspace creation but then propagated as an empty string to workspace related deployment, pods. So, probably creator annotation should not be propagated at all in such case. fixed in https://github.com/devfile/devworkspace-operator/pull/73

A user who created workspace is kube:admin which actually is not a real cluster user and don’t have a corresponding user record on the cluster (oc get users) and as a result its user ID is empty in the webhook handler info. So, is it OK to propagate kube:admin as “” user? Or instead we just need to deny workspace creation by kube:admin.