Add GitHub Actions workflow for .NET project

[Itsskell]

This workflow automates the build and test process for .NET projects on push and pull request events to the master branch.

Context

Explain the context or motivation behind this PR. Include links to any related Azure DevOps Work Items or GitHub issues.
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Description

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Risk Assessment (Low / Medium / High)

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Unit Tests Added or Updated (Yes / No)

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Additional Testing Performed

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Change Behind Feature Flag (Yes / No)

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Documentation Changes Required (Yes/No)

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Logging Added/Updated (Yes/No)

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Telemetry Added/Updated (Yes/No)

• Custom telemetry (e.g., counters, timers, error tracking) is added as needed.
• Events are tagged with proper metadata for filtering and analysis.
• Telemetry is validated in staging or test environments.

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Rollback Scenario and Process (Yes/No)

• Rollback plan is documented.

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Dependency Impact Assessed and Regression Tested (Yes/No)

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[Copilot]

Pull request overview

This pull request adds a GitHub Actions workflow to automate build and test processes for the Azure Pipelines Agent project. However, the workflow uses generic .NET commands that bypass the project's custom build system, which is incompatible with this codebase's architecture.

Changes:

• Adds a new GitHub Actions workflow file (.github/workflows/dotnet.yml) with a basic .NET build and test pipeline
• Configures the workflow to trigger on push and pull requests to the master branch
• Sets up .NET 8.0.x with standard dotnet restore, build, and test commands

[Copilot]

The dotnet version is set to 8.0.x, but the project's Common.props specifies support for both net8.0 and net6.0 target frameworks. The existing Azure Pipelines configuration (.vsts.ci.yml) uses targetFramework: 'net8.0' by default but the project officially supports both. Consider whether net6.0 testing should also be included, or document why only net8.0 is being tested in this GitHub Actions workflow.

Suggested change

	steps:
	- uses: actions/checkout@v4
	- name: Setup .NET
	uses: actions/setup-dotnet@v4
	with:
	dotnet-version: 8.0.x
	- name: Restore dependencies
	run: dotnet restore
	- name: Build
	run: dotnet build --no-restore
	- name: Test
	run: dotnet test --no-build --verbosity normal
	strategy:
	matrix:
	include:
	- framework: net6.0
	dotnet-version: 6.0.x
	- framework: net8.0
	dotnet-version: 8.0.x
	steps:
	- uses: actions/checkout@v4
	- name: Setup .NET
	uses: actions/setup-dotnet@v4
	with:
	dotnet-version: ${{ matrix.dotnet-version }}
	- name: Restore dependencies
	run: dotnet restore
	- name: Build
	run: dotnet build --no-restore -f ${{ matrix.framework }}
	- name: Test
	run: dotnet test --no-build --verbosity normal -f ${{ matrix.framework }}