docs: clarify that --userns=keep-id runs container as host UID
#27160
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Fixes: containers#24934 Signed-off-by: Daniel Lazaro <git@dlazaro.ca>
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Description
Currently, the docs state that the
--userns=keep-idoption maps the rootless user's UID/GID to the same values inside the container, but they don’t make explicit that the container's init process itself runs as that mapped UID/GID.This behaviour has caused some confusion (see #24934). In practice:
--userns=keep-id, rootless containers default to running asrootinside the container (mapped to the host UID externally).--userns=keep-id, the init process runs as the host UID/GID inside the container, overriding the image’sUSERinstruction unless--useris explicitly set.This PR updates the documentation to make that behaviour clear.
Does this PR introduce a user-facing change?