Use .NET 8 SDK

Directory.Build.props

@@ -16,6 +16,11 @@
         <RepositoryType>git</RepositoryType>
         <RepositoryUrl>https://github.com/NuclearPowered/Reactor</RepositoryUrl>
         <PackageLicenseExpression>LGPL-3.0-or-later</PackageLicenseExpression>
+
+        <!-- SourceLink -->
+        <EmbedUntrackedSources>true</EmbedUntrackedSources>
+        <IncludeSourceRevisionInInformationalVersion>false</IncludeSourceRevisionInInformationalVersion>
+        <ContinuousIntegrationBuild Condition="'$(GITHUB_ACTIONS)' == 'true'">true</ContinuousIntegrationBuild>
     </PropertyGroup>
 
     <ItemGroup>