I am new to armbian, and so far I managed to build a working image with some custom packages added and some removed by customizing `userpatches/lib.config`. Easy stuff and it's working great so far!
Now I need to build some packages from sources and get them added to the resulting image. The usual way I would do this, would be installing a cross toolchain, having a staging dir with includes and libs from the dev packages I add to the image, etc. But after building the base armbian image, on my system I see I have two docker images related to armbian (ghcr.io/armbian/docker-armbian-build and armbian.local.only/armbian-build), and I wonder if maybe the "local only" image is somehow like a "staging" image or how does this work.
So far I have not been able to find documentation about the procedure, is there any guide explaining how to achieve this?