[Don't merge] Granular nix playground

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Playground for testing CI builds via granular nix

Not intended to be ever merged

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!ci-nix-me

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!ci-nix-me

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!ci-nix-me

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!ci-nix-build

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!ci-nix-me

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!ci-nix-me

[georgeee]

Please fix tests (dune build from project's root is useful):

  | 2024-09-05 12:05:18 CEST | last 10 log lines:
  | 2024-09-05 12:05:18 CEST | > File "src/lib/mina_lib/tests/tests.ml", lines 69-72, characters 10-26:
  | 2024-09-05 12:05:18 CEST | > 69 \| ..........Genesis_ledger_helper.init_from_config_file
  | 2024-09-05 12:05:18 CEST | > 70 \|             ~genesis_dir:(make_dirname "genesis_dir")
  | 2024-09-05 12:05:18 CEST | > 71 \|             ~constraint_constants ~genesis_constants ~logger ~proof_level:None
  | 2024-09-05 12:05:18 CEST | > 72 \|             runtime_config
  | 2024-09-05 12:05:18 CEST | > Error: This expression has type
  | 2024-09-05 12:05:18 CEST | >          cli_proof_level:Genesis_constants.Proof_level.t option ->
  | 2024-09-05 12:05:18 CEST | >          (Precomputed_values.t * Runtime_config.t) Deferred.Or_error.t
  | 2024-09-05 12:05:18 CEST | >        but an expression was expected of type 'a Deferred.t
  | 2024-09-05 12:05:18 CEST | >
  | 2024-09-05 12:05:18 CEST | For full logs, run 'nix log /nix/store/4ji7a811a2l9w8n2d7x5p112kkahh212-mina_lib_tests-dev.drv'.