[FEAT] Don't start container if there is an error in config

[kuznetsss]

Is this a new feature request?

• I have searched the existing issues

Wanted change

Fail to start container if there is no config file or if there are errors in the config

Reason for change

I think it would be better to explicitly fail to start container if wireguard interface was not created

Proposed code change

Maybe add a check of return code of wg-quick command here:

docker-wireguard/root/etc/s6-overlay/s6-rc.d/svc-wireguard/run

Line 4 in fbb3a4b

wg-quick up wg0

Or add a new service to start after wireguard which will check whether wireguard network interface has been created.

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