endpoint validation completely fails if the app is mounted at a subpath

[mmerickel]

I have an openapi.yaml defined with endpoints like /foo, /bar, etc. I then invoke

    config.pyramid_openapi3_spec(spec_path, route='/api/openapi.yaml')
    config.pyramid_openapi3_add_explorer('/api/')

and I mount my routes at /api/foo, /api/bar, etc. There doesn't seem to be a way to coordinate these such that everyone is happy because pyramid_openapi3 is expecting the api document paths to be relative to the root of the application and there's no way to tell pyramid_openapi3 that I'm actually mounting the routes/spec at a subpath inside the application.