build: refactor makefile

cmd/root.go

@@ -3,8 +3,8 @@ package cmd
 import (
 	"crypto/tls"
 	"errors"
+	"io"
 	"io/fs"
-	"io/ioutil"
 	"log"
 	"net"
 	"net/http"
@@ -299,7 +299,7 @@ func setupLog(logMethod string) {
 	case "stderr":
 		log.SetOutput(os.Stderr)
 	case "":
-		log.SetOutput(ioutil.Discard)
+		log.SetOutput(io.Discard)
 	default:
 		log.SetOutput(&lumberjack.Logger{
 			Filename:   logMethod,