Support new runner architecture: windows-11-arm

[pbo-linaro]

GitHub announced support for new windows-arm64 runners:
https://github.blog/changelog/2025-04-14-windows-arm64-hosted-runners-now-available-in-public-preview/

action currently fails with:

Run mxschmitt/action-tmate@v3
node:events:502
      throw er; // Unhandled 'error' event
      ^

Error: spawn C:\msys64\usr\bin\bash.exe ENOENT
    at ChildProcess._handle.onexit (node:internal/child_process:285:1[9](https://github.com/pbo-linaro/github-actions/actions/runs/14453887171/job/40532635299#step:2:10))
    at onErrorNT (node:internal/child_process:483:16)
    at process.processTicksAndRejections (node:internal/process/task_queues:82:21)
Emitted 'error' event on ChildProcess instance at:
    at ChildProcess._handle.onexit (node:internal/child_process:291:[12](https://github.com/pbo-linaro/github-actions/actions/runs/14453887171/job/40532635299#step:2:13))
    at onErrorNT (node:internal/child_process:483:16)
    at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
  errno: -4058,
  code: 'ENOENT',
  syscall: 'spawn C:\\msys64\\usr\\bin\\bash.exe',
  path: 'C:\\msys64\\usr\\bin\\bash.exe',
  spawnargs: [ '-lc', 'pacman -S --noconfirm tmate' ]
}

Node.js v20.19.0

[jeremyd2019]

See also actions/partner-runner-images#88, and #86 in this repository.

[pbo-linaro]

I hope we can have a quicker solution than waiting for official image to include msys.

[jeremyd2019]

Sure: #217 then do:

    runs-on: windows-11-arm
    steps:
    - uses: msys2/setup-msys2@v2
      id: setup-msys2
    - uses: mxschmitt/action-tmate@v3
      with:
        msys2-location: ${{ steps.setup-msys2.outputs.msys2-location }}

[pbo-linaro]

It's working well, thanks.