Relax checking of userns_mode to allow supplying e.g. keep-id as config #3230
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When using docker-compose in combination with rootless podman containers it is desirable to use the keep-id user namespace mapping. By lifting the restriction to 'host' the userns_mode config can now be used with podman to supply the keep-id or more complex configurations. Signed-off-by: Jonathan Hettwer (bauen1) <j2468h@gmail.com>
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This change means, that docker-compose can now, like podman-compose containers/podman-compose#166, make use of the user namespaces features of podman.
For example, the following works when using rootless podman in combination with docker-compose: