fix tmp folder creation

cmd/server/main.go

@@ -41,9 +41,13 @@ func main() {
 
 	// create temp folder
 	path := "./tmp"
-	if err := os.MkdirAll(path, os.ModePerm); err != nil {
-		fmt.Printf("Error creating temp folder: %v\n", err)
-		return
+	if os.IsExist(os.Mkdir(path, os.ModePerm)) {
+		fmt.Printf("Temp folder already exists, skipping creation\n")
+	} else {
+		if err := os.MkdirAll(path, os.ModePerm); err != nil {
+			fmt.Printf("Error creating temp folder: %v\n", err)
+			return
+		}
 	}
 
 	r := gin.Default()