Rootless podman cannot map the 'render' gid (990) into the container
namespace (dank's subgid range is 100000+), so --group-add render fails to
start the container. GPU access actually comes from the /dev/kfd + /dev/dri
passthrough, checked host-side (the run user is already in 'render' on the
host). So add only the 'video' group (which resolves) and drop 'render'.
Update the group test to assert video present and render ABSENT (with the
rootless rationale), per the approved rootless config.
Frank
88dcd3cc0f