fix: Fixed redis user

backend/cmd/server/main.go

@@ -54,6 +54,7 @@ func main() {
 		redisAddr = "localhost:6379"
 	}
 
+	redisUser := os.Getenv("REDIS_USER")
 	redisPassword := os.Getenv("REDIS_PASSWORD")
 	redisDB := 0
 	if redisDBText := os.Getenv("REDIS_DB"); redisDBText != "" {
@@ -85,6 +86,7 @@ func main() {
 
 	redisClient := redis.NewClient(&redis.Options{
 		Addr:     redisAddr,
+		Username: redisUser,
 		Password: redisPassword,
 		DB:       redisDB,
 	})