docker镜像地址更改，使其支持国内环境

docker下安装srs出现如下错误

(base) cxkj@cxkj-server:/data/cxkj/srs/signaling$ CANDIDATE="192.168.110.206"
(base) cxkj@cxkj-server:/data/cxkj/srs/signaling$ sudo docker run --rm -it -p 1935:1935 -p 1985:1985 -p 8080:8080 \
>     --env CANDIDATE=$CANDIDATE -p 8000:8000/udp \
>     ossrs/srs:5 ./objs/srs -c conf/rtmp2rtc.conf
[sudo] password for cxkj: 
Unable to find image 'ossrs/srs:5' locally
5: Pulling from ossrs/srs
9ea8908f4765: Retrying in 1 second 
4f4fb700ef54: Retrying in 1 second 
d2b8ec5312dd: Retrying in 1 second 
5bafbc4ea134: Waiting 
docker: error pulling image configuration: download failed after attempts=6: dial tcp 31.13.94.37:443: i/o timeout.

1.创建/etc/docker目录

sudo mkdir -p /etc/docker

2.创建docker镜像配置文件

sudo tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": [
        "https://ox288s4f.mirror.aliyuncs.com",
        "https://registry.docker-cn.com",
        "http://hub-mirror.c.163.com",
        "https://mirror.ccs.tencentyun.com"
	]
}

EOF