chore: systematic syncthing_build_info metric

Signed-off-by: Jakob Borg <jakob@kastelo.net>

cmd/infra/strelaypoolsrv/main.go

@@ -27,6 +27,7 @@ import (
 
 	"github.com/syncthing/syncthing/cmd/infra/strelaypoolsrv/auto"
 	"github.com/syncthing/syncthing/lib/assets"
+	"github.com/syncthing/syncthing/lib/build"
 	"github.com/syncthing/syncthing/lib/geoip"
 	"github.com/syncthing/syncthing/lib/protocol"
 	"github.com/syncthing/syncthing/lib/rand"
@@ -146,6 +147,8 @@ func main() {
 
 	flag.Parse()
 
+	log.Println(build.LongVersionFor("strelaypoolsrv"))
+
 	requests = make(chan request, requestQueueLen)
 	geoip, err := geoip.NewGeoLite2CityProvider(context.Background(), geoipAccountID, geoipLicenseKey, os.TempDir())
 	if err != nil {