fix .log ending for empty parameter in linux systems

logging/logging.go

@@ -35,7 +35,11 @@ func NewLogger(file string, cfg *Config) (*Logger, error) {
 
 	if file == "" {
 		file = os.Args[0]
+		if filepath.Ext(file) != "" {
 			file = strings.Replace(filepath.Base(file), filepath.Ext(file), ".log", 1)
+		} else {
+			file = filepath.Base(file) + ".log"
+		}
 	}
 
 	encoderConfig := zap.NewProductionEncoderConfig()