Fix GitHub Actions workflows for UWP MSIX builds

[Copilot]

User requested confirmation ("aye or nay") on ability to build UWP app to MSIX format, then requested help to fix the GitHub Actions workflows.

Response: Aye - Build to MSIX is feasible with this codebase.

Changes Made

Fixed both GitHub Actions workflows to properly build the UWP application and generate MSIX packages:

1. Fixed msbuild.yml workflow

• Added proper platform matrix (x64, x86) - UWP apps require platform specification
• Fixed solution file path from "." to "eComBox.sln"
• Added artifact upload for build outputs
• Updated to use latest setup-msbuild@v2
• Added proper MSBuild parameters for UWP builds without signing

2. Fixed dotnet-desktop.yml workflow

• Renamed to "Build UWP MSIX" for clarity
• Removed incorrect WAP (Windows Application Packaging) project references
• Fixed environment variables (Solution_Name, AppxPackageDir)
• Added conditional logic for signed vs unsigned MSIX builds
• Removed non-existent unit test execution step
• Simplified to Release configuration with x64 platform
• Fixed artifact upload path to properly capture MSIX files

3. Added comprehensive documentation

• Created .github/workflows/README.md with workflow descriptions, certificate configuration instructions, troubleshooting guide, and local development instructions

Key Improvements

1. Works without secrets: Both workflows can run without requiring certificate secrets configured (will create unsigned packages for testing)
2. Proper UWP build parameters: Uses correct MSBuild parameters for UWP apps
3. Platform specification: Properly specifies x64/x86 platforms required for UWP
4. Artifact uploads: Both workflows now upload build artifacts
5. Clear documentation: Comprehensive README for workflow usage
6. Security validated: CodeQL scan passed with 0 alerts

Original prompt

Can you help me build this UWP app to msix? Just answer me aye or nay

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[ecomter]

@copilot Help me fix Github Action workflows

[Copilot]

@copilot Help me fix Github Action workflows

Fixed both GitHub Actions workflows in commit 8f7f324.

Changes made:

1. msbuild.yml - Now properly builds UWP app with x64/x86 platforms
2. dotnet-desktop.yml - Fixed to create MSIX packages with proper UWP parameters
3. Added comprehensive documentation in .github/workflows/README.md

Both workflows now work without requiring certificate secrets (will create unsigned packages for testing). To sign packages, add Base64_Encoded_Pfx and Pfx_Key secrets to the repository.