add customize image for docker

.github/workflows/release.yml

@@ -79,7 +79,7 @@ jobs:
 
     strategy:
       matrix:
-        variant: [qemu]
+        variant: [qemu, qemu-docker]
 
     steps:
       - name: Checkout

customize-qemu-docker.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+# Add Docker's official GPG key
+curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc
+
+# Add Docker's official repository to Apt sources
+cat > /etc/apt/sources.list.d/docker.list <<-EOF
+    deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian $(lsb_release -cs) stable
+EOF
+
+# Install packages
+apt-get --yes update
+apt-get --yes install qemu-guest-agent htop docker-ce