Rootless Docker requires loginctl enable-linger and systemctl --user,
which need systemd as PID 1 inside the container. Updated all platform
entries to use /lib/systemd/systemd (or /usr/lib/systemd/systemd for
Arch) as the container command instead of sleep infinity.
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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>