rebar3-nix: init at 0.1.0

[dlesl]

Motivation for this change

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[dlesl]

More context at #119452. This is a rebar3 plugin that can generate nix expressions for rebar3 projects. It is also intended to replace the rebar3 bootstrap script (but before making that change there's an alternative approach I'd like to investigate in #122633).

Before merging we should tag rebar3_nix and give it a version number, @gleber would 0.1.0 be OK with you?

As an example of how it can be used I've included an updateScript for rebar3.

[gleber]

Tag created: https://github.com/erlang-nix/rebar3_nix/tree/v0.1.0

[gleber]

I like this change!

I like this direction more than #122633

[dlesl]

Thanks, updated to use the tag

[dlesl]

@happysalada I'd like to invite you as a reviewer, not sure how though 🙂

[happysalada]

@dlesl thanks! I'm not sure how I can help here, but I support the initiative!

[happysalada]

With that one last change that was asked, I will add this on the list of things to merge on monday if somebody doesn't beat me to it.

[happysalada]

yesterday there was a problem with github, many PRs had the same weird editor config failure. It's transient. When you have a moment, just force push your branch again to trigger the pipeline. The tests will probably run fine.
I can merge when all the tests pass.