feat: close connection if no tunneling request is specified

main.go

@@ -1,11 +1,12 @@
 package main
 
 import (
-	"golang.org/x/crypto/ssh"
 	"log"
 	"os"
 	"tunnel_pls/server"
 	"tunnel_pls/utils"
+
+	"golang.org/x/crypto/ssh"
 )
 
 func main() {
@@ -20,7 +21,7 @@ func main() {
 	log.SetOutput(os.Stdout)
 	log.SetFlags(log.LstdFlags | log.Lshortfile)
 
-	privateBytes, err := os.ReadFile(utils.Getenv("ssh_private_key"))
+	privateBytes, err := os.ReadFile(utils.Getenv("SSH_PRIVATE_KEY"))
 	if err != nil {
 		log.Fatalf("Failed to load private key : %s", err.Error())
 	}