[FEAT] s6 readiness checking

[Joker9944]

Is this a new feature request?

• [X] I have searched the existing issues

Wanted change

Currently all s6 services report only up or down but not if they are ready or not. It would be nice to know if the services are ready to receive traffic.

Here is the documentation I found regarding readiness checking: https://skarnet.org/software/s6/notifywhenup.html

Reason for change

I'm writing a Kubernetes workload with an image based on this base image the service up status is great for startup and liveness probes but insufficient for readiness checks. Currently I'm checking like this /usr/bin/s6-svstat -o up /run/service/svc-kclient | grep --quiet true.

Proposed code change

I do know very little about kasm and s6 but am happy to volunteer my time. So I wanted to check first with the maintainers of this repo if a feature like this is feasible or even desirable.

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[LinuxServer-CI]

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[LinuxServer-CI]

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