[client] Get static system info once (#2965)

Get static system info once for Windows, Darwin, and Linux nodes

This should improve startup and peer authentication times

client/system/static_info.go

@@ -0,0 +1,46 @@
+//go:build (linux && !android) || windows || (darwin && !ios)
+
+package system
+
+import (
+	"context"
+	"sync"
+	"time"
+
+	"github.com/netbirdio/netbird/client/system/detect_cloud"
+	"github.com/netbirdio/netbird/client/system/detect_platform"
+)
+
+var (
+	staticInfo StaticInfo
+	once       sync.Once
+)
+
+func init() {
+	go func() {
+		_ = updateStaticInfo()
+	}()
+}
+
+func updateStaticInfo() StaticInfo {
+	once.Do(func() {
+		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+		wg := sync.WaitGroup{}
+		wg.Add(3)
+		go func() {
+			staticInfo.SystemSerialNumber, staticInfo.SystemProductName, staticInfo.SystemManufacturer = sysInfo()
+			wg.Done()
+		}()
+		go func() {
+			staticInfo.Environment.Cloud = detect_cloud.Detect(ctx)
+			wg.Done()
+		}()
+		go func() {
+			staticInfo.Environment.Platform = detect_platform.Detect(ctx)
+			wg.Done()
+		}()
+		wg.Wait()
+	})
+	return staticInfo
+}