Use Linux arm64 instance to build Python linux aarch64

[TonyXiang8787]

Linux ARM64 instances are now available in GitHub Actions for open source projects.

[TonyXiang8787]

@mgovers, build time comparison for aarch64 to build and test Python:

• main: 38 minutes via QEMU emulation, https://github.com/PowerGridModel/power-grid-model/actions/runs/12806705049/job/35705753644
• This PR: 4 minutes via native arm64 instance, https://github.com/PowerGridModel/power-grid-model/actions/runs/12837067435/job/35799999326

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[TonyXiang8787]

Now the GCC release build is the real bottleneck.

[mgovers]

great change, but I can't find whether they are free; only that the runner images are in public beta and provided by a partner (not GitHub Actions itself). https://github.com/actions/partner-runner-images/blob/main/README.md

I will approve after I know for sure that it's free for us.

[TonyXiang8787]

@mgovers look at here

https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/

[mgovers]

@mgovers look at here

https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/

great, thank you!