[arm64] Port scripts between garage-hortusfox to support arm64

Adds check for docker tag & arm64 in build.func and if present adds apparmor unconfined to get docker to work on non pve kernel

ct/github-runner.sh

@@ -13,7 +13,7 @@ var_ram="${var_ram:-2048}"
 var_disk="${var_disk:-8}"
 var_os="${var_os:-debian}"
 var_version="${var_version:-13}"
-var_arm64="${var_arm64:-no}"
+var_arm64="${var_arm64:-yes}"
 var_unprivileged="${var_unprivileged:-1}"
 var_nesting="${var_nesting:-1}"
 var_keyctl="${var_keyctl:-1}"