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While I'm also a big fan of nix and friends, one big issue with this is that setting up databases, or in general services, with nix-shell is impossible.

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That's not true. For example, in PostgREST we setup a nix-shell[1] that allows us to run tests in different PostgreSQL versions(from 9.6 to 14).

[1]: https://github.com/PostgREST/postgrest/tree/main/nix#working...

You can usually script the database setup and teardown and have the test suite use the same scripts you have available in a nix-shell.

pg_tmp [1] also helps

http://eradman.com/ephemeralpg/

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