ethereum.nix

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Add basic test for Lighthouse Validator. Pretty much just tests that the service starts up and doesn't crash immediately (see my comment on my last PR)

Not sure why mev-boost failed the build... I can't see anything in the logs available to me and it builds just fine locally.

@scottbot95 see the comment I've written and let's decide on a better approach rather than starting and stopping twice the service (which I'm totally fine if we introduce more checks in the middle).

@aldoborrero I updated the test for lighthouse validator tests per your suggestions. It's probably worth creating an issue to follow-up and update other tests/fill-in missing tests with this pattern. I wonder if it's also worth trying to formalize it in a CONTRIBUTING.md doc? Or maybe writing a re-usable python module or something? I'm not very familiar with python so not sure how feasible the latter is.