change filetype of sd-image

[Strix-Vyxlor]

Hello everybody,

I was wondering if I could change the filesystem type of the sd-image.
I would like to use btrfs instead of ext4.

I have taken a look in the source code, but the filesystem type is locked.
Do I just override this in my code, and how.

[tstat]

I was just thinking about a pi I would like to use btrfs on yesterday. I don't see a way to override this right now, but I do intend to work on this.

[tstat]

I broke off the hardcoded sd-image stuff into a separate module in #79. Using this branch, and following the standard nixos-install process, I have a pi 5 with btrfs on gpt. So, I think making the next steps would be to make a guide / figure out what can be made easier.

Building images formatted this way directly would also be nice.