CI: test WSL2

[AkihiroSuda]

Follow-up to:

• feat: add WSL2 driver #1721

runs-on: windows-2022-8-cores (larger runner) is known to support Hyper-V, but not sure if it supports WSL2.
Probably it should work: https://techcommunity.microsoft.com/t5/itops-talk-blog/wsl2-now-available-on-windows-server-2022/ba-p/3447570

[pendo324]

I can't find the documentation about windows-2022-8-cores on the GitHub larger runner page, but as long as it supports virtualization, WSL2 should work.

We're planning on using a Windows Server runner to test Finch's usage of this feature as well (the work-in-progress PR is here if you're interested in the entire process, but what's more interesting is probably the PowerShell script we're planning to run). For some details on how we're planning on doing it:

1. Install WinGet, and use it to install the other dependencies required to run Lima on Windows, but its not 100% necessary. Technically, you can just install via MSIs
   1. Unfortunately, this is not so simple on Windows Server right now, but it does come pre-installed with all other (modern) editions of Windows
   2. If this comes preinstalled on the GitHub provided runners, that would simplify things considerably
2. Install Git for Windows (provides git.exe, ssh.exe, cygpath.exe, tar.exe, gzip.exe, make.exe and more). Finch will do this via WinGet. Only the MinGit release is required
   1. Example winget command: winget install -e --id Git.MinGit
3. Install go. The most supported way seems to be by using the MSI installer directly.
   1. Example of installing go: Invoke-WebRequest -Uri 'https://go.dev/dl/go1.21.0.windows-amd64.msi' -OutFile 'go1.21.0.windows-amd64.msi'; Start-Process msiexec.exe -Wait -ArgumentList '/I C:\Users\Administrator\setup\go1.21.0.windows-amd64.msi /quiet'
4. Enable WSL2 (requires restart)
   1. wsl --install

From here, the runner should be setup, and the remaining steps should be very similar to how the CI is run on macOS/Linux (clone repo, make, run tests), with the key difference being specifying the usage of the experimental wsl2.yaml.

I guess a maintainer would have to add the runner to this repo in order to test anything right?

[AkihiroSuda]

windows-2022-8-cores

Added by myself. This is a “larger” runner managed by GitHub.
https://docs.github.com/en/actions/using-github-hosted-runners/about-larger-runners/about-larger-runners