Make it working on macos

[niku]

You can see testing result at https://github.com/niku/setup-elixir/actions/runs/45241114.

Notes

• At this time, unlike linux, bob don't have prebuild package for macOS.
• Homebrew that is package manager for macOS provides packages for erlang and elixir. However, these packages have limitations for version control. For example, elixir package provides only 1.10.1. Therefore, we can't install 1.9.1.

[axelson]

Does this need anything before it can be merged? I'm trying to get elixir-lsp/vscode-elixir-ls#31 merged

[niku]

It is ready to merge 👍 Go ahead please.

[jclem]

I've reached out to @ericmj to see if there's any plans to build for macOS, but it sounds like their current build platform doesn't offer macOS.

Not knowing exactly what the build dependencies are for OTP/Erlang and Elixir, it looks like this just works, for the most part, so maybe it's at least a good stop-gap solution.

[jclem]

@niku After thinking this through a bit more, I don't think we should offer a solution that builds from source—this would unfortunately re-build OTP and Elixir for every individual workflow run, and I'm wary of users accidentally eating up their usage with this action.

I'm going to close the PR and open an issue to discuss pre-built macOS images.

[jclem]

#23

[niku]

Thank you for your comment. I agree your concerns. I'll tackle to #23 .