Fluent validation rules in .NET 9 OpenApi

[rigtigeEmil]

It'd be super nice if fluent validation rules were available in the generated open API file with .NET 9's new built-in AddOpenApi functionality.
I know libraries exist(ed) for generating these and adding them in swagger, but these seem to be deprecated or poorly maintained, and have some reliance on swagger.

[rigtigeEmil]

@avgalex I see the milestone tag added, do you know when a release is planned for v6? 😊

[saithis]

I toyed around with this a bit here: https://github.com/saithis/dotnet-playground/tree/main/OpenApiFluentValidationApi (this is my experimentation repo, don't expect clean code :D)
Feel free to copy the code or make nuget package out of it.