Add PR validation workflow for automated build verification

[Copilot]

This PR adds a GitHub Actions workflow that automatically validates Pull Requests by ensuring the project builds successfully with the PR's source code.

What's Added

A new workflow file .github/workflows/pr-validation.yml that:

• Triggers automatically on PR events (opened, synchronized, reopened) targeting the main branch
• Mirrors the build process from the existing dotnet.yml publishing workflow
• Validates the main library project (Maui.ColorPicker.csproj) for efficient and focused validation
• Uses the same environment (Windows runner, .NET 8.0, MAUI workloads, SkiaSharp EAP source)

Key Features

The validation workflow includes all essential build steps:

1. Setup .NET 8.0 environment
2. Install MAUI workload for cross-platform builds
3. Add SkiaSharp NuGet source (required dependency)
4. Restore workloads and dependencies for the main project
5. Build the core library project in Release configuration

Benefits

• Early feedback - Catch build issues before code review
• Consistent validation - Same build process as production publishing
• Efficient validation - Focuses on the core library that gets published to NuGet
• Multi-platform support - Validates all target frameworks (Android, iOS, macOS Catalyst, Windows)
• Zero maintenance - Automatically runs without manual intervention

The workflow excludes all publishing steps (NuGet packaging, releases, deployments) and focuses purely on build validation of the main library project, making it fast and suitable for PR validation.

Fixes #24.

Warning

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[Copilot]

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[nor0x]

lgtm - let's try it

[Copilot]

Pull Request Overview

Adds a GitHub Actions workflow for automated PR validation that builds the project to catch issues early. The workflow triggers on PR events targeting the main branch and validates the complete solution using the same build environment as the production workflow.

Key changes:

• New PR validation workflow with automated build verification
• Mirrors production build process with .NET 8.0, MAUI workloads, and SkiaSharp dependencies
• Excludes publishing steps to focus purely on build validation

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[nor0x]

@copilot building Maui.ColorPicker/Maui.ColorPicker.csproj should be enough

[Copilot]

@copilot building Maui.ColorPicker/Maui.ColorPicker.csproj should be enough

Updated the workflow to build only Maui.ColorPicker.csproj instead of the entire solution for more focused and efficient PR validation. The workflow now specifically restores and builds just the main library project. (b47b4b3)