debug: add JWT secret empty check logging

internal/middleware/auth.go

@@ -1,6 +1,7 @@
 package middleware
 
 import (
+	"log"
 	"net/http"
 	"strings"
 	"time"
@@ -39,7 +40,11 @@ func JWTAuth() gin.HandlerFunc {
 		claims := &Claims{}
 
 		token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
-			return []byte(config.Cfg.JWT.Secret), nil
+			secret := config.Cfg.JWT.Secret
+			if secret == "" {
+				log.Printf("JWT Secret is empty, config.Cfg: %+v", config.Cfg)
+			}
+			return []byte(secret), nil
 		})
 
 		if err != nil || !token.Valid {