[Bug 2040547] Re: Runtime version mismatch with nuget.org on .NET 8 RC2

[Mateus Rodrigues de Morais]

** Merge proposal linked:
   https://code.launchpad.net/~mateus-morais/ubuntu/+source/dotnet8/+git/dotnet8/+merge/454827

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Title:
  Runtime version mismatch with nuget.org on .NET 8 RC2

Status in dotnet8 package in Ubuntu:
  In Progress
Status in dotnet8 source package in Mantic:
  In Progress
Status in dotnet8 source package in Noble:
  In Progress

Bug description:
  [ Impact ]

   * Users are currently unable to run RID-specific dotnet operations on a .NET
     project, e.g. `dotnet build -r linux-x64`.

   * Since this is a critical bug that could affect real-world scenarios of
     building and publishing RID-specific applications, the fix is being
     backported to Mantic.

   * The upload includes a patch that was suggested by Microsoft [1] and fixes
     the issue by updating the VMR source-built runtime version to the same one
     Microsoft publishes, to prevent the .NET CLI tools from trying to download
     a linux-x64 runtime package that does not exist.

  [ Test Plan ]

   * To reproduce the bug, one must install dotnet-sdk-8.0 version
     8.0.100~rc2-0ubuntu1 and run:

     ```
     $ dotnet new console -o Test
     $ cd Test
     $ dotnet build               # should work
     $ dotnet build -r linux-x64  # should not work
     ```

   * Version 8.0.100~rc2-0ubuntu2 (in PPA [2]) should have the last
     command working.

  [ Where problems could occur ]

   * The patch effectively only changes the version string of the resulting .NET
     source-built runtime. No feature or behavior-related code changes are made.

   * A regression can occur if a third-party software depends on the specific
     version string of the runtime present in 8.0.0~rc2-0ubuntu1.

   * This is highly unlikely as the vast majority of .NET software targets a
     major .NET version, and the diff between both versions is in the build
     section of the version string: 8.0.0-rc.2.23479.6 (new) vs
     8.0.0-rc.2.23475.17 (old).

  [1] https://github.com/dotnet/source-build/issues/3673#issuecomment-1779566707
  [2] https://launchpad.net/~mateus-morais/+archive/ubuntu/dotnet8-rc2-runtime-version-fix

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