Replaces the misc/build.func bootstrap with the two-root core loader.
No other change: the engine contract (var_*, update_script, start,
build_container, description) is identical on both engines.
* add helper function for get_arch_value
* [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
* revert added tags, remove apparmor unconfined, move to setup_docker
CanbiZ (MickLesk)