Add .NET Core Desktop GitHub Actions Workflow

[lemillermicrosoft]

Summary

This pull request adds a new GitHub Actions workflow for building, testing, signing, and packaging a WPF or Windows Forms desktop application built on .NET Core.

Changes

• Create a new .NET Core Desktop GitHub Actions workflow file at .github/workflows/dotnet-desktop.yml
• Configure the workflow to run on push and pull_request events for the main branch
• Set up a build matrix for Debug and Release configurations
• Define environment variables for the solution name and other project paths
• Install .NET Core 6.0.x and set up MSBuild.exe
• Restore the application to populate the obj folder with RuntimeIdentifiers
• Commented out sections for handling signing certificates, creating app packages, and uploading build artifacts

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[lemillermicrosoft]

/sk generate-pr-description

[github-actions[bot]]

Generate PR Description: succeeded ✅ https://github.com/lemillermicrosoft/skonsole/actions/runs/6231135989