Add a VM test to make sure the nixos module actually works #16
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This is a very simple nixos VM test. All it does is launch tailscale-manager with a single static route, and watches syslog output to make sure it starts up and calls tailscale (in this case a test fixture taking tailscale's place) to add that route, so we can at least be confident that the systemd unit and the app minimally work.
Take a look at the github Checks tab to see what a run looks like.
A blog post I found helpful: https://blakesmith.me/2024/03/02/running-nixos-tests-with-flakes.html