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In case you don't already know, there are Github-hosted runners that run Windows arm64 [1]

Also, it's not what you're asking, but self-hosted runners are a security nightmare if you don't have the hardware to completely isolate them from your local network.

[1] https://github.com/actions/partner-runner-images/blob/main/i...

They don't seem to be available for private repos (unless you sign up for Github Teams or Enterprise).

Microsoft offers Windows on ARM servers. Could slam the Windows ARM ISO on a 3rd party VPS as well.

Any recommendation for an Arm vps? I tried using a Hetzner server but apparently their server offering doesn't support mountint Windows Arm images.

Your best bet is probably Azure. Otherwise you can spin up an AWS graviton VM and install windows on it yourself.