Adding Ubuntu — almost for free

Standing up the Debian backend was real work — mmdebstrap rootfs assembly, .deb packaging, on-device apt, a glibc toolchain alongside the musl one. Adding Ubuntu on top of that was almost free. The latest video walks through it, and the headline is how little there was to do: Ubuntu is apt, so it rides the same machinery, and a [yoe] project can now build Alpine, Debian, and Ubuntu images side by…