Alpine Linux 时间同步

先安装：
    apk add chrony
    (1/2) Installing libcap (2.25-r1)
    (2/2) Installing chrony (3.2-r2)
    Executing chrony-3.2-r2.pre-install
    Executing busybox-1.27.2-r11.trigger
    OK: 831 MiB in 87 packages

接着执行：

    chronyd