feat: Investigate using eroFS for our active/passive/recovery images

[Itxaka]

Is your feature request related to a problem? Please describe.

Suposedly eroFS is a filesystem especifically for read only images, which brings speed to them and real RO status.
currently our images are not really RO, as they can be mounted and written to if needed.

Describe the solution you'd like

Implement eroFs as a viable fs for images

Describe alternatives you've considered

Additional context

erofs works by having a source and transforming it into a eroFS image, so the changes are non-trivial. It would require to change the dump process of the souorces to generate the erofs image directly or use a transition image and transform that into an erofs image

Supposedly grub should be able to mount those easily and even boot from them directly so maybe that would make our boot process simpler (less loop devices?)

Still ahving to transform it, would eb a bit of a pain in the ass but maybe we could do a prototype to see if we gain speed.