windows-11-arm runner support

[messense]

• https://github.blog/changelog/2025-04-14-windows-arm64-hosted-runners-now-available-in-public-preview/
• https://github.com/actions/partner-runner-images/blob/main/images/arm-windows-11-image.md

It currently fails with:

Run rustup toolchain install stable --target wasm32-wasip1 --profile minimal --no-self-update
C:\a_temp\580263fa-a453-43bd-ad81-0b71ea3e688d.sh: line 1: rustup: command not found

https://github.com/PyO3/maturin/actions/runs/14514848605/job/40721477825?pr=2558

[jcotton42]

Comparing the software list between Windows Server 2025 x64 and Windows 11 ARM64 it appears that rustup is bundled in the former, but not the latter. So the action needs to be adjusted to download when running on Windows ARM.

An issue has been opened to add rustup to the ARM image actions/partner-runner-images#77.

[joe-p]

This specific comment includes a fix: actions/partner-runner-images#77 (comment)

I've leveraged this approach in #145

[larseggert]

Yes, that workaround works.

Note that the installed clang seems to be the amd64 version, too, so bindgen is unhappy.