[FEAT] Add Healthcheck support #214

Is this a new feature request?

• I have searched the existing issues

Wanted change

That would be convenient to have healtcheck on this container.

Reason for change

This proves useful for rootless podman when we cannot rely on sdnotify=conmon.
It would be beneficial to every container environment.

Proposed code change

This check would do the trick. expired stands for a ready server with no recent user interaction.

/usr/bin/curl -ks -f http://localhost:8443/healthz | /usr/bin/tee /dev/stderr | /usr/bin/jq -e '.status == "alive" or .status == "expired"'