Some sample projects in this repo, such as the EverythingServer, won't currently build/run in a GitHub codespace without "fiddling".

Simply opening the repo in a codespace and attempting to run the EverythingServer gives this error:

I think that the default container image GitHub uses for codespaces includes .NET 8 (LTS) but not .NET 9 (STS), and that's what you get in this repo since there is no devcontainer.json to tell it otherwise.

I tried to simply change "global.json" to use the installed SDK (8.0.412) but that still fails because the EverythingServer.csproj specifies a TFM of .NET9.

One fix might be to add a devcontainer.json that includes both .NET 8 and .NET 9.