Fix official build (dotnet#5040)

* fix official build

* work around for official build issue

* add missing fix

Author: frank-dong-ms-zz

Directory.Build.targets

@@ -38,4 +38,14 @@
   </Target>
 
   <Import Project="$(ToolsDir)/versioning.targets" Condition="Exists('$(ToolsDir)/versioning.targets')" />
+
+ <!-- Workaround: AssemblyInfo.cs is not embedded -->
+ <!-- https://github.com/dotnet/sourcelink/issues/572 -->
+  <PropertyGroup>
+    <TargetFrameworkMonikerAssemblyAttributesPath>$([System.IO.Path]::Combine('$(IntermediateOutputPath)','$(TargetFrameworkMoniker).AssemblyAttributes$(DefaultLanguageSourceExtension)'))</TargetFrameworkMonikerAssemblyAttributesPath>
+  </PropertyGroup>
+  <ItemGroup>
+    <EmbeddedFiles Include="$(GeneratedAssemblyInfoFile)"/>
+  </ItemGroup>
+
 </Project>