Compiling under Oracle Linux 9.x fails

[leocb]

Describe the Bug

If I try to compile the source under Oracle Linux 9.x at some point I get this error:

Build FAILED 

/home/lbottaro/source/.dotnet/sdk/6.0.115/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(129,5): error NETSDK1083: The specified RuntimeIdentifier 'ol.9.0-x64' is not recognized. [/home/lbottaro/source/src/runtime/artifacts/source-build/self/src/Build.proj]

and lots of [warning]s - don't know if these are relevant

[Warning] Detected packages in the cache that should be source-built, but contents don't match. See /home/lbottaro/source/artifacts/conflict-report/before-arcade/ for usage details: [/home/lbottaro/source/repos/arcade.proj]

I discussed this with @omajid and apparently there's a PR to fix this already: /dotnet/runtime/pull/81115 - But taking a quick glance at the changed files, it seems OL9 ids are still missing.

Here's the complete build log:
Build_0517165001.zip

[MichaelSimons]

Unfortunately because the RIDs are missing, you will need to follow the Building for New OS (Using a RID unknown to .NET) instructions. I will try and push dotnet/runtime#81115 along.

[MichaelSimons]

@richlander - another scenario that would benefit from the proposed RID plan.