refactor: improve setup-wsl action to support native Windows testing #2630
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Instead of building inside WSL on the host disk, we should build inside the WSL file system as that is significantly faster and avoids the interop bottleneck. For this, we naively copy over the repository after checkout into WSL; and operate from in there.
Pending TODO is how we can properly cache contents inside WSL; as the cache action currently does not seem to pick it up properly.