netbird: send logs to syslog

[LuisMitaHL]

Netbird writes logs to persistent storage by default on /var/log/netbird/client.log. This change aligns the behavior of logs to other services in OpenWrt, whose logs are sent to syslog.

Maintainer: @oskarirauta
Compile tested: Confiabits MT7981, SNAPSHOT r27350-c4a9265160
Run tested: Confiabits MT7981, SNAPSHOT r27350-c4a9265160

[wehagy]

Bump PKG_RELEASE

packages/net/netbird/Makefile

Line 5 in f73bf31

PKG_RELEASE:=1

[1715173329]

Not all services send their logs to syslog and it's not forced. I'm not sure if it will "pollute" syslog.
/var/log is actually in memory and used by other services too.

[wehagy]

Good point, I can see how much "noise" netbird produces, but anyway I think is good to have this option, maybe by default disabled, but can be enabled via uci config, sometimes I'm trying to debug, and is a little bit of pain logread -fe <put a service here> and tail -f /var/log/netbird/client.log, is good to have everything unified, what can be make too is change the log level to warning or error, default is info.

The option to change the log location is nice to have too.

[LuisMitaHL]

I didn't realize that /var is in RAM. Good to know, no need to worry about flash wear.

I created the PR because, as a consequence of a bug with openwrt and mwan3 (netbirdio/netbird#2116) the service was generating errors continuously and the log file had grown a lot in several days.
I believe that if the logs were in syslog, the error would be more obvious and the process could have been stopped earlier.

Also this behavior aligns with the existing behavior of other similar software, such as tailscale.

[LuisMitaHL]

Bump PKG_RELEASE

packages/net/netbird/Makefile

Line 5 in f73bf31

PKG_RELEASE:=1

Done, thanks