Add: thumb quality for 3rd storage policy (#1763)

Add thumb quality for third party storage policy.

pkg/filesystem/driver/upyun/handler.go

@@ -235,7 +235,9 @@ func (handler Driver) Thumb(ctx context.Context, file *model.File) (*response.Co
 		return nil, errors.New("failed to get thumbnail size")
 	}
 
-	thumbParam := fmt.Sprintf("!/fwfh/%dx%d", thumbSize[0], thumbSize[1])
+	thumbEncodeQuality := model.GetIntSetting("thumb_encode_quality", 85)
+
+	thumbParam := fmt.Sprintf("!/fwfh/%dx%d/quality/%d", thumbSize[0], thumbSize[1], thumbEncodeQuality)
 	thumbURL, err := handler.Source(ctx, file.SourceName+thumbParam, int64(model.GetIntSetting("preview_timeout", 60)), false, 0)
 	if err != nil {
 		return nil, err