Reorganize GitHub Actions report as a test-report extension (dotnet#54722)

* Reorganize GitHub Actions report as a test-report extension

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: 3 people

docs/core/testing/microsoft-testing-platform-features.md

@@ -31,7 +31,7 @@ Use the following path based on your goal:
 
 - Need to customize terminal output: [Terminal output](./microsoft-testing-platform-terminal-output.md) (built-in)
 - Need TRX or Azure DevOps reports: [Test reports](./microsoft-testing-platform-test-reports.md) (extension)
-- Need GitHub Actions-native output (log groups, annotations, and job summary): [GitHub Actions report](https://www.nuget.org/packages/Microsoft.Testing.Extensions.GitHubActionsReport) (extension, experimental)
+- Need GitHub Actions-native output (log groups, annotations, and job summary): [GitHub Actions report](./microsoft-testing-platform-test-reports.md#github-actions-reports) (extension, experimental)
 - Need coverage data: [Code coverage](./microsoft-testing-platform-code-coverage.md) (extension)
 - Need crash or hang diagnostics: [Crash and hang dumps](./microsoft-testing-platform-crash-hang-dumps.md) (extension)
 - Need to retry failed tests: [Retry](./microsoft-testing-platform-retry.md#retry) (extension)
@@ -54,11 +54,7 @@ These features require installing NuGet packages.
 
 **[Test reports](./microsoft-testing-platform-test-reports.md)**
 
-Generate test report files (TRX, Azure DevOps).
-
-**[GitHub Actions report](https://www.nuget.org/packages/Microsoft.Testing.Extensions.GitHubActionsReport)** (experimental, introduced in MTP 2.3.0)
-
-Emit GitHub Actions-native workflow commands so test runs produce a first-class experience: per-assembly log groups, failure annotations (surfaced in the workflow **Annotations** tab and, when the source location resolves, on the pull request's **Files changed** diff), a Markdown job summary appended to `GITHUB_STEP_SUMMARY`, and slow-test notices. The extension activates automatically when the `GITHUB_ACTIONS` environment variable is `true`, or elsewhere with the `--report-gh` switch. Each feature can be turned on or off individually with the `--report-gh-groups`, `--report-gh-annotations`, `--report-gh-step-summary`, and `--report-gh-slow-test-notices` options, and the slow-test threshold is set with `--report-gh-slow-test-threshold`. Register it manually with `builder.AddGitHubActionsProvider()`.
+Generate test report files (TRX, HTML, JUnit, CTRF, Azure DevOps, GitHub Actions).
 
 **[Code coverage](./microsoft-testing-platform-code-coverage.md)**
 

docs/core/testing/microsoft-testing-platform-test-reports.md

@@ -1,6 +1,6 @@
 ---
 title: Microsoft.Testing.Platform (MTP) test reports
-description: Learn about the MTP extensions that create test report files (TRX, HTML, JUnit, CTRF, Azure DevOps).
+description: Learn about the MTP extensions that create test report files (TRX, HTML, JUnit, CTRF, Azure DevOps, GitHub Actions).
 author: evangelink
 ms.author: amauryleve
 ms.date: 06/16/2026
@@ -163,3 +163,30 @@ builder.TestHost.AddAzureDevOpsProvider();
 > The **MTP version** column lists the MTP release in which each option first became available in a stable build. The Azure DevOps extension itself became stable in MTP 1.9.0 with `--report-azdo` and `--report-azdo-severity`; the remaining options were added in MTP 2.3.0.
 
 The extension automatically detects that it is running in continuous integration (CI) environment by checking the `TF_BUILD` environment variable.
+
+## GitHub Actions reports
+
+The GitHub Actions report emits GitHub Actions-native workflow commands so test runs produce a first-class experience on the runner: per-assembly log groups, failed and skipped test annotations (surfaced in the workflow **Annotations** tab and, when the source location resolves, on the pull request's **Files changed** diff), a Markdown job summary appended to the file referenced by `GITHUB_STEP_SUMMARY`, and slow-test notices.
+
+The extension activates only when the run is on GitHub Actions (the `GITHUB_ACTIONS` environment variable is `true`) and the `--report-gh` switch is set; otherwise it does nothing. When active, each feature is enabled by default and can be turned off individually with its `--report-gh-*` option.
+
+> [!NOTE]
+> Available in MTP starting with version 2.3.0. This extension is experimental, and its options and output format might change in a future version.
+
+### Manual registration
+
+```csharp
+var builder = await TestApplication.CreateBuilderAsync(args);
+builder.AddGitHubActionsProvider();
+```
+
+### Options
+
+| Option | MTP version | Description |
+|---|---|---|
+| `--report-gh` | 2.3.0 | Enables the GitHub Actions report generator so test runs emit workflow commands. Requires the run to be on GitHub Actions. |
+| `--report-gh-groups` | 2.3.0 | Enables or disables per-assembly log groups. Valid values are `on` (default) and `off`. Requires `--report-gh`. |
+| `--report-gh-annotations` | 2.3.0 | Enables or disables annotations for failed and skipped tests. Valid values are `on` (default) and `off`. Requires `--report-gh`. |
+| `--report-gh-step-summary` | 2.3.0 | Enables or disables writing a Markdown job summary to the file referenced by `GITHUB_STEP_SUMMARY`. Valid values are `on` (default) and `off`. Requires `--report-gh`. |
+| `--report-gh-slow-test-notices` | 2.3.0 | Enables or disables slow-test notices. Valid values are `on` (default) and `off`. Requires `--report-gh`. |
+| `--report-gh-slow-test-threshold` | 2.3.0 | The duration a test can run before a slow-test notice is emitted. Accepts a bare number of seconds or a value with a unit suffix such as `90s`, `2m`, or `1.5h`. The default is `60s`. Requires `--report-gh`. |

docs/navigate/devops-testing/toc.yml

@@ -307,7 +307,7 @@ items:
                     displayName: MTP,terminal,test reporter,ANSI,progress
                   - name: Test reports
                     href: ../../core/testing/microsoft-testing-platform-test-reports.md
-                    displayName: MTP,TRX,test report,Azure DevOps
+                    displayName: MTP,TRX,test report,Azure DevOps,GitHub Actions
                   - name: Code coverage
                     href: ../../core/testing/microsoft-testing-platform-code-coverage.md
                     displayName: MTP,code coverage,coverage