chore: memoize detected GPUs (#5385)

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

pkg/xsysinfo/gpu.go

@@ -2,18 +2,29 @@ package xsysinfo
 
 import (
 	"strings"
+	"sync"
 
 	"github.com/jaypipes/ghw"
 	"github.com/jaypipes/ghw/pkg/gpu"
 )
 
+var (
+	gpuCache     []*gpu.GraphicsCard
+	gpuCacheOnce sync.Once
+	gpuCacheErr  error
+)
+
 func GPUs() ([]*gpu.GraphicsCard, error) {
+	gpuCacheOnce.Do(func() {
 		gpu, err := ghw.GPU()
 		if err != nil {
-		return nil, err
+			gpuCacheErr = err
+			return
 		}
+		gpuCache = gpu.GraphicsCards
+	})
 
-	return gpu.GraphicsCards, nil
+	return gpuCache, gpuCacheErr
 }
 
 func TotalAvailableVRAM() (uint64, error) {