add full docker suport

init.d/run.sh

@@ -3,7 +3,7 @@ set -euo pipefail
 
 apt update
 
-apt install -y openssh-server vim ca-certificates curl gnupg
+apt install -y openssh-server vim ca-certificates curl gnupg iputils-ping
 
 # Configure system-wide proxy for this container.
 PROXY_URL="http://10.8.0.1:7890"
@@ -26,14 +26,8 @@ fi
 
 # Install Docker CLI only (docker-ce-cli) from official Docker repo.
 install -m 0755 -d /etc/apt/keyrings
-curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
-chmod a+r /etc/apt/keyrings/docker.asc
-ARCH="$(dpkg --print-architecture)"
-. /etc/os-release
-echo "deb [arch=${ARCH} signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu ${VERSION_CODENAME} stable" \
-  >/etc/apt/sources.list.d/docker.list
-apt update
-apt install -y docker-ce-cli
+export DOWNLOAD_URL="https://mirrors.tuna.tsinghua.edu.cn/docker-ce"
+curl -fsSL https://raw.githubusercontent.com/docker/docker-install/master/install.sh | sh
 
 mkdir -p /run/sshd
 
@@ -54,4 +48,5 @@ if [[ -f "${SCRIPT_DIR}/authorized_keys" ]]; then
   install -m 600 "${SCRIPT_DIR}/authorized_keys" /root/.ssh/authorized_keys
 fi
 
+# Copy init.sh to /init
 cp /init.d/init.sh /init