Added the ability to boot a custom init binary or execute a script, just like Docker does.

This means you can choose /bin/bash as the init, start the container, and use it like an isolated pivot_root container without relying on systemd screaming about an old kernel version.

TLDR: A cool hack to sneak into the container without systemd, exactly how Docker works. You can even boot Arch Linux on a potato kernel.

Testing:

https://t.me/DroidspacesCI/337?single