What is the expected usage of source-built assets?

We need to decide what we expect users are going to do with the assets built from source-build.

For example, do we expect people to publish the NuGet packages that were built to some feed? Do we expect consumers to restore these NuGet packages in their apps?

One usage I can see is for the RID-specific NuGet packages to get published. For example, if someone wants to build a self-contained application that runs on Tizen, they would need to reference the `runtime.tizen.4.0.0-armel.Microsoft.NETCore.App` package. But Microsoft doesn't build/publish that package. So I could imagine a case where someone uses `source-build` to build a RID-specific `Microsoft.NETCore.App` package, and publishes it so users can build self-contained applications on platforms that aren't officially built by Microsoft.

@dotnet/source-build-contrib