Merge pull request #1391 from dotnet/fix-1390

Avoid writing server.json multiple times in a single pack

Author: AArnott

src/Nerdbank.GitVersioning.Tasks/build/Nerdbank.GitVersioning.targets

@@ -311,9 +311,11 @@
     </PropertyGroup>
   </Target>
 
-  <!-- Support for MCP servers: stamp version in server.json -->
+  <!-- Support for MCP servers: stamp version in server.json
+       Set the Condition to NOT run when RIDs and RID are both set and RID-specific packages are being created
+       (indicating an inner build which would share the output file with the outer build). -->
   <Target Name="NBGV_StampMcpServerJson"
-          Condition="'$(PackageType)' == 'McpServer'"
+          Condition="'$(PackageType)' == 'McpServer' and ('$(RuntimeIdentifiers)'=='' or '$(RuntimeIdentifier)'=='' or '$(CreateRidSpecificToolPackages)' != 'true')"
           BeforeTargets="GenerateNuspec;_GetPackageFiles"
           DependsOnTargets="GetBuildVersion">
     <ItemGroup>