Sign .msi file too

Author: edvilme

eng/Signing.props

@@ -10,7 +10,8 @@
   <ItemGroup Condition="'$(RID)' == 'win-x86'">
     <ItemsToSign Include="$(DotnetCoreUninstallOutputDirectory)**/dotnet-core-uninstall.dll;
                             $(DotnetCoreUninstallOutputDirectory)**/dotnet-core-uninstall.resources.dll;
-                            $(DotnetCoreUninstallOutputDirectory)**/dotnet-core-uninstall.exe" />
+                            $(DotnetCoreUninstallOutputDirectory)**/dotnet-core-uninstall.exe;
+                            $(DotnetCoreUninstallMSIInstallerFile)" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(RID)' == 'osx-x64' OR '$(RID)' == 'osx-arm64'">