Don't build installers in source-build

Author: jkoritzinsky

src/Framework/App.Ref/src/Microsoft.AspNetCore.App.Ref.sfxproj

@@ -39,7 +39,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.DotNet.Build.Tasks.Archives" Version="$(MicrosoftDotNetBuildTasksArchivesVersion)" />
-    <PackageReference Condition="'$(RuntimeIdentifier)' == 'linux-x64' or '$(RuntimeIdentifier)' == 'linux-arm64'" Include="Microsoft.DotNet.Build.Tasks.Installers" Version="$(MicrosoftDotNetBuildTasksInstallersVersion)" />
+    <PackageReference Condition="('$(RuntimeIdentifier)' == 'linux-x64' or '$(RuntimeIdentifier)' == 'linux-arm64') and '$(DotNetBuildSourceOnly)' != 'true'" Include="Microsoft.DotNet.Build.Tasks.Installers" Version="$(MicrosoftDotNetBuildTasksInstallersVersion)" />
     <LinuxPackageDependency Include="dotnet-targeting-pack-$(DotnetTargetingPackDependencyMajorMinorVersion)" Version="$(DotnetTargetingPackDependencyVersion)" />
   </ItemGroup>
 

src/Framework/App.Runtime/src/Microsoft.AspNetCore.App.Runtime.sfxproj

@@ -53,7 +53,7 @@
     </Reference>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Condition="'$(RuntimeIdentifier)' == 'linux-x64' or '$(RuntimeIdentifier)' == 'linux-arm64'" Include="Microsoft.DotNet.Build.Tasks.Installers" Version="$(MicrosoftDotNetBuildTasksInstallersVersion)" />
+    <PackageReference Condition="('$(RuntimeIdentifier)' == 'linux-x64' or '$(RuntimeIdentifier)' == 'linux-arm64') and '$(DotNetBuildSourceOnly)' != 'true'" Include="Microsoft.DotNet.Build.Tasks.Installers" Version="$(MicrosoftDotNetBuildTasksInstallersVersion)" />
     <LinuxPackageDependency Include="dotnet-runtime-$(DotnetRuntimeDependencyMajorMinorVersion)" Version="$(DotnetRuntimeDependencyVersion)" />
   </ItemGroup>