document the env var

DeterminateSystems · Nov 21, 2023 · 4410dcc · 4410dcc
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@@ -58,6 +58,12 @@ jobs:
 
 See [`.github/workflows/ci.yml`](.github/workflows/ci.yml) for a full example.
 
+### Advanced Usage
+
+* If KVM is available, the installer exports the `DETERMINATE_NIX_KVM` environment variable set to 1.
+  If KVM is not available, `DETERMINATE_NIX_KVM` is set to 0.
+  This can be used in combination with GitHub Actions' `if` syntax for turning on and off steps.
+
 ## Installation Differences
 
 Differing from the upstream [Nix](https://github.com/NixOS/nix) installer scripts: