Net10 upgrade

[paveliak]

This PR upgrades runner to using .Net 10 (specifically 10.0.103):

• Source generator is added for the BuildContants.cs file
• RunnerService project is migrated to SDK style to avoid C# Dev Kit warnings
• C# DevKit extension is added to the Codespace
• Code and tests is refactored to allow developing/testing in VStudio/VSCode without prior running of dev.sh build/layout
• On Windows VStudio 2026 is needed to develop for 10.0.103

[Copilot]

Pull request overview

This PR upgrades the GitHub Actions runner from .NET 8 to .NET 10 (SDK 10.0.103). It touches every project file to update the target framework, replaces the MSBuild-based BuildConstants.cs generation with a Roslyn incremental source generator, migrates RunnerService.csproj to SDK-style project format, removes NuGet packages that are now in-box with .NET 10, and adjusts tests to be runnable without a prior dev.sh build/layout.

Changes:

• All project files updated from net8.0 to net10.0, SDK version bumped to 10.0.103, and in-box NuGet packages removed.
• New Runner.Sdk.Generator Roslyn source generator replaces the MSBuild GenerateConstant target for BuildConstants code generation, with IDE-friendly fallbacks for commit hash, runtime ID, and version.
• RunnerService.csproj migrated from legacy to SDK-style, test infrastructure updated (dev.sh test now uses dotnet test directly, ProcessExtensionL0 test adds PATH-based node lookup), and C# DevKit extension added to the Codespace.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/global.json	SDK version bumped from 8.0.418 to 10.0.103
src/dev.sh	SDK version updated, GIT_COMMIT_HASH added, CommitHash passed to builds/tests, test command changed to dotnet test
src/dir.proj	Removed GenerateConstant and Test targets, added Generator cleanup to Clean
src/Runner.Sdk.Generator/BuildConstantsGenerator.cs	New Roslyn incremental source generator for BuildConstants
src/Runner.Sdk.Generator/Runner.Sdk.Generator.csproj	New project file for the source generator (targets netstandard2.0)
src/Runner.Sdk/Runner.Sdk.csproj	Updated TFM, added source generator project reference and CompilerVisibleProperties, removed in-box packages
src/Runner.Sdk/BuildConstants.cs	Deleted (now generated by source generator)
src/Sdk/Sdk.csproj	Updated TFM, removed in-box packages
src/Runner.Worker/Runner.Worker.csproj	Updated TFM, removed System.Threading.Channels
src/Runner.Common/Runner.Common.csproj	Updated TFM, removed in-box packages
src/Runner.Listener/Runner.Listener.csproj	Updated TFM, removed Microsoft.Win32.Registry
src/Runner.Plugins/Runner.Plugins.csproj	Updated TFM
src/Runner.PluginHost/Runner.PluginHost.csproj	Updated TFM, removed System.Runtime.Loader
src/Runner.Service/Windows/RunnerService.csproj	Migrated to SDK-style project format
src/Test/Test.csproj	Updated TFM, removed System.Threading.ThreadPool
src/Test/L0/ProcessExtensionL0.cs	Added FindInPath helper for node lookup, fallback to layout path
src/ActionsRunner.sln	Added Generator project, added x64/x86 platform configurations
.devcontainer/devcontainer.json	Updated .NET version, added C# DevKit extension

Comments suppressed due to low confidence (1)

src/Runner.Sdk.Generator/BuildConstantsGenerator.cs:41

• Process.Start can return null if the process cannot be started (e.g., git is not on PATH). This would result in a NullReferenceException on the next line when accessing process.StandardOutput. Additionally, if git fails (e.g., the directory is not a git repo), no error is reported and the output may be empty or contain an error message that gets injected into the generated source.

Consider wrapping this in a try/catch and returning a sensible default (like "N/A") on failure, and adding a null check for process.

        private static string GetCommitHash(string projectDir)
        {
            using var process = Process.Start(new ProcessStartInfo("git", "rev-parse HEAD")
            {
                WorkingDirectory = projectDir,
                RedirectStandardOutput = true,
                UseShellExecute = false,
            });
            return process.StandardOutput.ReadToEnd().Trim();
        }