ilab-wrapper: don't map UIDs if we're already running as root #729
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Background
See df88857
Issue
Introduced a regression [1] where it's no longer possible to run the script as root, as the subuid map ends up being empty and this causes an error:
Solution
Avoid UID mapping if we're already running as root.
Motivation
We want to also be able to run the script as root, for example as part of a systemd service.
[1] RHELAI-798