registry support Mac (#11960)

contrib/offline/manage-offline-container-images.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 OPTION=$1
 CURRENT_DIR=$(cd $(dirname $0); pwd)
@@ -118,6 +118,8 @@ function register_container_images() {
 		cp ${CURRENT_DIR}/registries.conf         ${TEMP_DIR}/registries.conf
 		sed -i s@"HOSTNAME"@"$(hostname)"@  ${TEMP_DIR}/registries.conf
 		sudo cp ${TEMP_DIR}/registries.conf   /etc/containers/registries.conf
+  elif [ "$(uname)" == "Darwin" ]; then
+    echo "This is a Mac, no configuration changes are required"
 	else
 		echo "runtime package(docker-ce, podman, nerctl, etc.) should be installed"
 		exit 1