In reply to @nivviv "twimc: i have been": Interesting, I have a similar setup
for grabnim, but instead of default runner, I use image with zig and zigcc
preinstalled.
`zigcc` `zig_target`defines:
https://codeberg.org/janAkali/grabnim/src/branch/master/config.nims
nimscript for zig arguments and flags:
https://codeberg.org/janAkali/grabnim/src/branch/master/zig_build_all.nims
workflow:https://codeberg.org/janAkali/grabnim/src/branch/master/.forgejo/workf
lows/build.yaml
release: https://codeberg.org/janAkali/grabnim/releases/tag/ci-latest

I didn't bother with macos support, because I don't want to use github.
Also I had a single problem with zig: clang uses a lot of memory at linking step
(~5GB), but only in release mode. And my dirt cheap 1G VPS was out of memory.
But I found a solution - just adding `--opt:size` nim flag reduces memory usage
significantly.