[Feature Request] register mieru as daemon for linux platforms

[Soneoylys]

In my use case, I've setup mieru in China VPS, mita in Japan VPS then use reverse proxy via socks to convert standard VPN protocol for my friends to create a proper LAN setup, it works well
But sometimes mieru client in China side will quit working for no reason, I need to restart it manually, maybe setup a on-failure auto restart daemon will help, any suggestions?

[enfein]

Because we don't know if user want to start the client on system boot, this is not provided by default. However, you can refer https://github.com/enfein/mieru/blob/main/configs/examples/mieru.service to implement the feature.

Also, you can share the log so we are able to know the reason why the process exit.

[Soneoylys]

maybe install the systemd but not enable it by default is better option
idk where I can grab the log from tho, it's not in /var/log for me

[enfein]

See https://github.com/enfein/mieru/blob/main/docs/operation.md#view-mieru-client-log

The systemd unit requires user input to set MIERU_CONFIG_JSON_FILE variable, so we let user to create it if needed.