How to solve fail build Uno.Skia.Gtk on Linux of GitHub Action

[lindexi]

The command as follow will run fail on Linux of GitHub Action.

dotnet build FooUno.Skia.Gtk.csproj

The fail message is:

MSBuild version 17.9.6+a4ecab324 for .NET
  Determining projects to restore...
/usr/share/dotnet/sdk/8.0.202/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.ImportWorkloads.targets(38,5): error NETSDK1178: The project depends on the following workload packs that do not exist in any of the workloads available in this installation: Microsoft.maccatalyst.Sdk.net8
/usr/share/dotnet/sdk/8.0.202/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.ImportWorkloads.targets(38,5): error NETSDK1178: You may need to build the project on another operating system or architecture, or update the .NET SDK.

You can solve it by split the restore and build step by the commands :

dotnet restore -p:TargetFramework=net8.0 -r linux-x64 FooUno.Skia.Gtk.csproj
dotnet build -c release -r linux-x64 -p:TargetFramework=net8.0 --no-restore FooUno.Skia.Gtk.csproj

[spouliot]

The problem and your workaround hints that this is the old dotnet/sdk#21877 striking again.

It's possible that some of dependent assemblies (to you main Gtk project) have multiple target frameworks and that's still causing problems to build from the command line... I suggest upvoting the issue.

[jeromelaban]

This is a behavior that we'll be adjusting in 5.2