Static binary for `omnix-cli`

[srid]

• Have packages.omnix-cli be statically built, both for Linux and macOS (should work on recent Mac systems we use at @juspay)
• Build it in CI, and upload it somewhere (GitHub release?) for people to download.

With om being a static binary it can even introspect (https://github.com/juspay/nix-health/issues/6) and do Nix install for the user.

Static binary status:

• [x] Linux: https://github.com/juspay/omnix/pull/185
• [x] macOS (aarch64): https://github.com/juspay/omnix/pull/158

[srid]

Another benefit of providing static binary: we don't have to provide a binary cache for this repo.

[srid]

A static binary would also help reduce CI times for installing omnix on GitHub Actions,

https://github.com/srid/haskell-template/actions/runs/10115656001/job/27976909384?pr=136

Just by reducing closure size.

[srid]

https://github.com/srid/haskell-template/pull/137

40 seconds to install on Ubuntu,

50 seconds to install on macOS,

https://github.com/srid/haskell-template/actions/runs/10222457925/job/28287081748

[shivaraj-bh]

What was the time before on macOS?

For Linux you mentioned it was 3 minutes (source: https://github.com/juspay/omnix/pull/158#issuecomment-2253251466).

[srid]

3 minutes for both:

https://github.com/srid/haskell-template/actions/runs/10115744844/job/27977180380

So it is an improvement overall.

Once we have curl'able install, it should reduce further I hope.