Add minimal, "HTTP endpoint discovery only mode" bootstrapping

[schnerring]

Is your feature request related to a problem? Please describe.

During build time, I generate the OpenAPI spec by setting <OpenApiGenerateDocumentsOnBuild>true</OpenApiGenerateDocumentsOnBuild> in the Wolverine API project, which runs dotnet-getdocument to generate the spec.

It all works fine in VS 2022, when the Postgres Docker container is up and running. But building in CI environments and the like, I get a DB connection error, because no Postgres DB exists.

Describe the solution you'd like

It would be nice to be able to bootstrap Wolverine it requiring a working DB connection.

Maybe a IServiceCollection extension similar to .DisableAllExternalWolverineTransports()?

        Host = await AlbaHost.For<Program>(builder =>
        {
            builder.ConfigureServices(services =>
            {
                // Override the Wolverine configuration to disable external DB connectivity
                services.DisableAllExternalDatabaseConnections();
            });
        });

Describe alternatives you've considered

For CI build steps it is of course possible to add a Posgres container.