add mutex fo safety working with files

pkg/amoClient/amo.go

@@ -12,6 +12,7 @@ import (
 	"os"
 	"penahub.gitlab.yandexcloud.net/backend/quiz/common.git/model"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/gofiber/fiber/v2"
@@ -27,6 +28,7 @@ type Amo struct {
 	integrationSecret string
 	rateLimiter       *limiter.RateLimiter
 	amoStorageURL     string
+	fileMutex         sync.Mutex
 }
 
 type AmoDeps struct {
@@ -579,6 +581,8 @@ func (a *Amo) downloadFile(urlFile string) (*os.File, error) {
 }
 
 func (a *Amo) UploadFileToAmo(urlFile string, accessToken string) (*models.ValuesFile, error) {
+	a.fileMutex.Lock()
+	defer a.fileMutex.Unlock()
 	localFile, err := a.downloadFile(urlFile)
 	if err != nil {
 		return nil, err