[immucore] Drop mount libraries and use the mount syscall directly

[Itxaka]

We currently use a lib for mounting stuff on immucore but we should really not use something like that when we have the mount syscall and can use that directly.

If we want more flexibility around mounting, we could create our own wrappers around that in the sdk, but for the basic usage done in immucore it doesnt make sense.

We currently use https://github.com/containerd/containerd JUST for the mounting which is excessive.

[mudler]

Is this still relevant?

[Itxaka]

yep, still using libs for it when we could whip even our own if we need something simple to uise. Makes no sense to me to have dependencies for something as simple as this.