Is your feature request related to a problem? Please describe.

Many users enforce policies that docker containers should not run as root user. There should be no reason to run as root by default.

Describe the solution you'd like

Create a user and set USER in Dockerfile.

Additional context

A sample warning from a k8s deploy is like this:

policy require-run-as-nonroot/run-as-non-root fail: validation error: Running as root is not allowed. Either the field spec.securityContext.runAsNonRoot must be set to true, or the fields spec.containers[].securityContext.runAsNonRoot, spec.initContainers[].securityContext.runAsNonRoot, and spec.ephemeralContainers[*].securityContext.runAsNonRoot must be set to true. rule run-as-non-root[0] failed at path /spec/securityContext/runAsNonRoot/ rule run-as-non-root[1] failed at path /spec/containers/0/securityContext/runAsNonRoot/