Microsoft.NETCore.Platforms: fix graph not being updated on pack. (#82851)

Co-authored-by: Tom Deseyn <[email protected]>
Co-authored-by: Alexander Köplinger <[email protected]>

Author: 3 people

src/libraries/Microsoft.NETCore.Platforms/src/Microsoft.NETCore.Platforms.csproj

@@ -17,6 +17,7 @@
     <AvoidRestoreCycleOnSelfReference>true</AvoidRestoreCycleOnSelfReference>
     <!-- TODO: Remove with AvoidRestoreCycleOnSelfReference hack. -->
     <PackageValidationBaselineName>$(MSBuildProjectName)</PackageValidationBaselineName>
+    <BeforePack Condition="'$(AdditionalRuntimeIdentifiers)' == ''">UpdateRuntimeJson;$(BeforePack)</BeforePack>
 
     <_generateRuntimeGraphTargetFramework Condition="'$(MSBuildRuntimeType)' == 'core'">$(NetCoreAppToolCurrent)</_generateRuntimeGraphTargetFramework>
     <_generateRuntimeGraphTargetFramework Condition="'$(MSBuildRuntimeType)' != 'core'">net472</_generateRuntimeGraphTargetFramework>