When building from docker image; ie git clone -b current --single-branch https://github.com/vyos/vyos-build && cd vyos-build && docker run --rm -it --privileged -v $(pwd):/vyos -w /vyos vyos/vyos-build:current bash, you get the following warning:
N: Repository 'Debian bookworm' changed its 'non-free component' value from 'non-free' to 'non-free non-free-firmware' N: More information about this can be found online in the Release notes at: https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.html#non-free-split
This is fixed via adding non-free-firmware to vyos-build/data/live-build/config/archives/trixie.list.chroot:1