Add support for arm64 on linux

[kraptor]

Hello @ringabout,

following the changes for #54 and following how Crystal does it, this is an attempt to add support for Linux ARM64 (you may want to use aarch64 instead, as you wish, but Asahi linux identifies itself as linux_arm64 so I think you may want to support both?).

In order to this PR to work, you need to request credits to ARM itself by opening an issue, but as far as I see, it should be fine as Nim is fully opensource.

Unfortunately, you need to discuss details with them directly via email, as I'm not officially part of the Nim "organization" (probably you will be contacted by @shipra-ps, maybe they can help in here directly?).

You may need to supply the github.run_id they provide and adapt/play a bit with the CI yaml, but I hope this is a kickstart.

Thanks!

[kraptor]

Related to #23

[veaceslavdoina]

@ringabout, is there any progress on that?

@kraptor, GitHub recently announced Linux arm64 hosted runners now available for free in public repositories (Public Preview) and we can switch to the native arm runners

• ubuntu-22.04-arm
• ubuntu-24.04-arm

[shipra-ps]

Hi Team,
Now Linux arm64 hosted runners are available for free in public repositories. You may check the attached link for your reference https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/

[ringabout]

It doesn't seem to support linux arm64

[veaceslavdoina]

can we use devel option?

    runs-on: ubuntu-22.04-arm64
    steps:
      - uses: jiro4989/setup-nim-action@v2
        with:
          nim-version: devel
          repo-token: ${{ secrets.GITHUB_TOKEN }}

nim -v

Nim Compiler Version 2.3.1 [Linux: arm64]
Compiled at 2025-02-11
Copyright (c) 2006-2025 by Andreas Rumpf
git hash: 1a7bc6d878ff04709ebb1002010fd53b4ba02179
active boot switches: -d:release

nimble -v

nimble v0.16.4 compiled at 2025-02-11 11:17:21
git hash: 123f97a5e4ee9ba35720c0869e19a047c43c797e

[ringabout]

Download links should be adapted to arm64 as well. e.g.

choosenim/src/choosenimpkg/download.nim

Line 46 in 9b47975

if "x" & $arch in aname: