Enable other OS's for `.github/workflows/copilot-setup-steps.yml`

[jonathanpeppers]

Currently you can only define a workload with runs-on: ubuntu-latest:

• https://docs.github.com/en/enterprise-cloud@latest/copilot/customizing-copilot/customizing-the-development-environment-for-copilot-coding-agent#upgrading-to-larger-github-hosted-github-actions-runners

We have some scenarios that are specific to Windows and iOS, that would make windows-latest and macos-latest images quite useful.

[nhu-do]

Thanks Jonathan! We've added this feature request to our internal tracking 👍.

[s-bauer]

@nhu-do Is there any update on this? Is WSL an option?
In quite a few enterprise projects we are still bound to Windows, either due to .NET Framework or some other dependencies that are not available otherwise. This unfortunately prevents us from using Coding Agent :/

[jonathanpeppers]

What seems tricky about this, we need the AI to decide what OS is best to run on for a given task.

It could perhaps be based on a label we manually add.

[danquirk]

It would be sufficient for us if we had to manually opt in with some settings file like copilot-setup-steps.yml. Alternatively infer it from the runner/pool type used in whatever required PR pipeline exists. If my PR validation happens on Windows pools then it's highly likely I want GHCA to run on a Windows GH Runner.