Hi, I just discovered this ITP bug report. I have also started working on making a zig Debian package. So far I've been able to generate a zig 0.9.0 package on bullseye after backporting llvm-13 from testing.
I had not originally planned for this to be an official package for Debian, I just wanted a working zig on my system so that I could compile (and package) the river wayland compositor. I thought I should speak up in case I can be of some help with the official packaging efforts. You can find my package at https://github.com/NickHastings/zig-debian and https://mentors.debian.net/package/zig/ Regards, Nick.