Configurations.props

<Project>
  <PropertyGroup>
    <PackageConfigurations>
      netcoreapp3.0-Windows_NT;
      netcoreapp3.0-Unix;
    </PackageConfigurations>
    <BuildConfigurations>
      $(PackageConfigurations);
      netcoreapp-Windows_NT;
      netcoreapp-Unix;
    </BuildConfigurations>
  </PropertyGroup>
</Project>