Generates an OpenAPI 3.1.0 discovery document from an Elixir config file.
mix mpp.openapi path/to/mpp_openapi.exs
mix mpp.openapi path/to/mpp_openapi.exs path/to/openapi.jsonThe config file must evaluate to the keyword list or map accepted by
MPP.Discovery.OpenApi.generate/1. Output defaults to openapi.json.