test: add integration nixos tests

cottand / leng

:zap: fast dns server, built to block advertisements and malware servers

https://cottand.github.io/leng/

MIT License

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Closed cottand closed 2 months ago

cottand commented 2 months ago

Adds integration tests that spin up a VM to test systemctl start, DNS and metrics APIs

These are meant to be the base for more complex tests in the future, to hopefully narrow down issues like https://github.com/Cottand/leng/issues/55.

This PR also changes the NixOS module to allow for more paths for the sources database.