Zig build-system: add CI/CD and fix build

[kassane]

No description provided.

[alonfaraj]

Good idea to add every build system mentioned in llama.cpp Readme!

I'm wondering if zig worth a separate workflow or it better to integrate it with the existing build workflow.

[kassane]

Good idea to add every build system mentioned in llama.cpp Readme!

The readme has a brief introduction on how to use zig build.

I'm wondering if zig worth a separate workflow or it better to integrate it with the existing build workflow.

I chose to separate the CI/CD from the zig, in case the @ggerganov author wants to discontinue it for any reason. And it would also be easier to detect the problem individually.

[ggerganov]

We can update to latest master and merge this if it is still of interest

[kassane]

We can update to latest master and merge this if it is still of interest

Done! (rebased)