Add systemd cgroup path spec

The systemd cgroup path convention implemented in runc/crun should be added to the spec.

This convention is becoming important for cgroup v2, because rootless containers depends on systemd for cgroup delegation in most environments.

specs-go/config: add systemd cgroup support

Do we have any plan to move this forward? Thanks!

Thanks for opening #1115, but I meant adding proper spec for the existing implementation of systemd cgroupsPath, e.g. user.slice:nerdctl:deadbeef
https://github.com/containerd/nerdctl/blob/07c3ca23743308987aa3b26b1fb7b560804ff9a4/cmd/nerdctl/run_cgroup_linux.go#L53

I didn't mean adding new fields for systemd.

config-linux: add systemd cgroup path convention

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