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This PR focuses on optimizing go-test CI times on Windows. It: - backs the `$RUNNER_TEMP` directory with a RAM disk. This directory is used by actions like cache, setup-go, and setup-terraform as a staging area - backs `GOCACHE`, `GOMODCACHE`, and `GOPATH` with a RAM disk - backs `$GITHUB_WORKSPACE` with a RAM disk - that's where the repository is checked out - uses preinstalled Go on Windows runners - starts using the depot Windows runner From what I've seen, these changes bring test times down to be on par with Linux and macOS. The biggest improvement comes from backing frequently accessed paths with RAM disks. The C drive is surprisingly slow - I ran some performance tests with [fio](https://fio.readthedocs.io/en/latest/fio_doc.html#) where I tested IOPS on many small files, and the RAM disk was 100x faster. Additionally, the depot runners seem to have more consistent performance than the ones provided by GitHub.