installer: make sure we can always test the installer in ci and locally #12059
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Just now there is a dependency on cachix, which means we cannot test the installer in CI if forks do not have the necessary secrets set up. We replace this with a simple http server that serves the installer and can be both used in CI and locally.
Another nice side effect is that now every pull request has a downloadable installer: https://github.com/NixOS/nix/actions/runs/12340760590
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