Bug#995670: zig packages available

[nick black <dankamongmen@gmail.com>]

if you've got packaging dependent on zig, or want to help beta
test zig on debian, there are packages available here:

 https://salsa.debian.org/nickblack/zig/-/jobs/6923961/artifacts/download

alternatively, you can add the apt source:

 deb http://dsscaw.com/repos/apt/debian unstable main

i'll push packages here as they change.

i've just successfully built ghostty using
-Doptimize=ReleaseFast with these packages, and things seem to
be more or less working.