KVM on GitHub Actions

We at DetSys are happy to announce that the Determinate Nix Installer now enables KVM on Linux GitHub Actions runners by default. This means that you can now do things like run NixOS tests on Actions without needing to resort to custom runners. The one-liner to enable it:

- uses: DeterminateSystems/nix-installer-action@main

We ran an experiment early last week to vet this in a subset of Nix installs (we A/B all new releases) and we’re confident in the outcome. Please give it a try and let us know if you run into any issues!