security | runasuser mandates Dockerfile USER UID not name

[ReSearchITEng]

Current image cannot be used securely with runAsUser as the Dockerfile mentions a username instead of user id (UID).

More on: https://kubernetes.io/docs/tasks/configure-pod-container/security-context/

the error k8s gives when trying to set runAsUser: 1001 is that it cannot guarantee the id to be really the specified one.