Integrating external services using services-flake

TODO: Write this!

For now, see the code: https://github.com/juspay/todo-app/pull/22

Things to highlight:

  • services-flake provides pre-defined configurations for many services, reducing a bunch of lines to just services.<service>.<instance>.enable = true;
  • Data directory for all services in services-flake is local to the project working directory, by default
  • Best practices:
    • Use Unix sockets for local development and CI to avoid binding to ports (which is global to the interface)
    • Write integration tests using the reserved test process in process-compose-flake.
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