gRPC service fails when called from parent directory

I am testing gRPC services, but am running into some trouble.

I am using the `grpc` template for the server and the documented client. I am using VS Code and am on Ubuntu 23.04 x64.

https://learn.microsoft.com/en-us/aspnet/core/tutorials/grpc/grpc-start?view=aspnetcore-8.0&tabs=visual-studio-code#create-the-greeter-client

If I launch the server as `./grpc`, everything works. If I launch it as `./child-directory/grpc`, it does not.