Directory.Build.props

<Project>
  <PropertyGroup>
    <LangVersion>latest</LangVersion>
    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Nullable" Version="1.3.0" PrivateAssets="All" />
  </ItemGroup>
  <PropertyGroup Condition="'$(GITHUB_ACTIONS)' == 'true'">
    <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>
  </PropertyGroup>
</Project>