workaround for now for resolving with container

[dadhi]

Hi @caoyanmin,

Indeed, there is something strange going on when you're passing the container into the UseServiceProviderFactory.
Seems like the bug that causing to not share the registrations with the final version of container (likely the problem a bit deeper).

So until the bug is fixed dadhi/DryIoc#555, you may consider using the workaround in this PR by requesting the final container back from the host:

            var host = hostBuilder.Build();

            // WORKAROUND for now!
            container = host.Services.GetService<IContainer>() as Container;