NuGet package: Build fails when installing system-wide packages

[alnlarsen]

We have this msbuild target for verifying that an image installation succeeded:

<Target Name="VerifyInstalledPackages"
        DependsOnTargets="ProcessOpenTapPackageList"
        BeforeTargets="GenerateOpenTapReferenceProps">
  <ItemGroup>
    <PackageXmlFiles Include="@(OpenTapPackagesToInstall-> '$(OutDir)Packages/%(Identity)/package.xml')"/>
  </ItemGroup>
  <Error Condition="'@(PackageXmlFiles)' != '' AND !Exists('@(PackageXmlFiles)')" Text="Some packages failed to install."/>
</Target>

It checks if a package.xml file exists for all the packages specified in the project. This fails for system-wide packages which are not added to the debug installation, which causes all builds to fail.

[github-actions]

A fix for this is in OpenTAP version 9.22.0-beta.37+14a687f2 or later.