Add netbird-bin package

Only contains the binary release for amd64 atm. Have not had time to
figure out the build process / add more arches.

Will also probably be a little buggy still. There's a system service
included which needs to run for netbird to work.

Setup is a tiny bit cumbersome in that you have to enable the service
_first_ (which will complain about no auth found) and then manually run
`netbird up` with your pre-shared key or sso or whatever method you
choose to authenticate.

srcpkgs/netbird-bin/files/netbird/log/run

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+exec vlogger -t netbird -p daemon

srcpkgs/netbird-bin/files/netbird/run

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+exec 2>&1
+exec netbird --log-file=console service run