Document RuntimeInfoContributor in v4 Info actuator endpoint

[Copilot]

Documents the new RuntimeInfoContributor added in Steeltoe 4.1.0 that exposes runtime environment information.

Changes

• Added "Runtime info" section under Built-in Contributors documenting the 7 exposed properties:

  • runtimeName - .NET runtime name and version
  • runtimeVersion - CLR version
  • runtimeIdentifier - Platform RID (e.g., "linux-x64")
  • processArchitecture - Process architecture (e.g., "X64", "Arm64")
  • osArchitecture - OS architecture
  • osDescription - OS description
  • osVersion - OS version

• Updated Sample Output to include the runtime section:

{
  "runtime": {
    "runtimeName": ".NET 10.0.0",
    "runtimeVersion": "10.0.0",
    "runtimeIdentifier": "linux-x64",
    "processArchitecture": "X64",
    "osArchitecture": "X64",
    "osDescription": "Ubuntu 22.04.3 LTS",
    "osVersion": "Unix 5.15.0.88"
  }
}

Original prompt

Summary

Update the v4 documentation for the Info actuator endpoint to document the new RuntimeInfoContributor being added in SteeltoeOSS/Steeltoe#1640.

Changes Required

Update the file docs/docs/v4/management/info.md with the following content:

# Info

The Steeltoe Info endpoint exposes information about the running application, such as its version and the version of Steeltoe in use.

Information is collected from all `IInfoContributor` implementations registered in the application. 
Steeltoe includes a couple of contributor implementations out of the box that you can use. 
You can also write your own implementations. 

## Configure Settings

The following table describes the configuration settings that you can apply to the endpoint. 
Each key must be prefixed with `Management:Endpoints:Info:`.

| Key | Description | Default |
| --- | --- | --- |
| `Enabled` | Whether the endpoint is enabled | `true` |
| `ID` | The unique ID of the endpoint | `info` |
| `Path` | The relative path at which the endpoint is exposed | same as `ID` |
| `RequiredPermissions` | Permissions required to access the endpoint, when running on Cloud Foundry | `Restricted` |
| `AllowedVerbs` | An array of HTTP verbs at which the endpoint is exposed | `GET` |

## Enable HTTP Access

The URL path to the endpoint is computed by combining the global `Management:Endpoints:Path` setting with the `Path` setting described in the preceding section. 
The default path is `/actuator/info`.

See the [Exposing Endpoints](./using-endpoints.md#exposing-endpoints) and [HTTP Access](./using-endpoints.md#http-access) sections for the steps required to enable HTTP access to endpoints in an ASP.NET Core application.

To add the actuator to the service container and map its route, use the `AddInfoActuator` extension method. 

Add the following code to `Program.cs` to use the actuator endpoint:

```csharp
using Steeltoe.Management.Endpoint.Actuators.Info;

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddInfoActuator();
```

> [!TIP]
> It is recommended that you use `AddAllActuators()` instead of adding individual actuators;
> this enables individually turning them on/off at runtime via configuration.

## Built-in Contributors

### Build info

This contributor exposes file/version info for both the application and the included version of Steeltoe. 

### Configuration

This contributor exposes any values below the `Info` configuration key.  For example:

```json
{
  "Info": {
    "Some": {
      "Example": {
        "Key": "some-example-value"
      }
    }
  }
}
```

> [!TIP]
> When combined with the [Placeholder Configuration Provider](../configuration/placeholder-provider.md),
> compound configuration values can be exposed originating from other places in configuration.

### Git properties

This contributor exposes information from the `git.properties` Spring Boot file, if available.  The file contains information from git, such as branch/tag name, commit hash, and remote. 

> [!TIP]
> For an example of how to use this contributor within MSBuild using [GitInfo](https://github.com/devlooped/GitInfo), see the [Steeltoe Management sample](https://github.com/SteeltoeOSS/Samples/tree/4.x/Management/src).

### Runtime info

This contributor, added in Steeltoe 4.1.0, exposes information about the environment in which the application is running. It includes:

| Property | Description |
| --- | --- |
| `runtimeName` | The name and version of the .NET runtime (for example, ".NET 10.0.0") |
| `runtimeVersion` | The version of the common language runtime |
| `runtimeIdentifier` | The runtime identifier (RID) of the platform (for example, "linux-x64", "win-x64") |
| `processArchitecture` | The process architecture (for example, "X64", "Arm64") |
| `osArchitecture` | The operating system architecture |
| `osDescription` | A description of the operating system |
| `osVersion` | The operating system version |

## Sample Output

The response is always returned as JSON: 

```json
{
  "git": {
    "branch": "main",
    "build": {
      "host": "examplehost",
      "time": "2024-10-11T18:44:28.9255701Z",
      "user": {
        "email": "user@email.com",
        "name": "testuser"
      },
      "version": "2.1.0"
    },
    "commit": {
      "id": "90d0870a363fafcb50981b7038608b763e527e05",
      "time": "2024-10-08T17:30:57Z"
    },
    "remote": {
      "origin": {
        "url": "https://github.com/SteeltoeOSS/Samples"
      }
    },
    "tags": "2.1.0-644-g90d0870a"
  },
  "Some": {
    "Example": {
      "Key": "some-example-value"
    }
  },
  "applicationVersionInfo": {
    "ProductName": "ExampleApp",
    "FileVersion": "1.0.0.0",
    "ProductVersion": "1.0.0+df774c38b734857909d54b796fffbb717eced4a4"
  },
  "steeltoeVersionInfo": {
    "ProductName": "Steeltoe.Management.Endpoint",
    "FileVersion": "4.0.519.27703",
    "ProductVersion": "4.0.519-alpha+6c377e2ac3"
 ...

</details>



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[Copilot]

Pull request overview

This PR updates the v4 Info actuator documentation to cover the new RuntimeInfoContributor in Steeltoe 4.1.0 and adjusts the build-and-stage GitHub Actions workflow.

Changes:

• Adds a “Runtime info” built-in contributor section documenting the runtime-related properties exposed by the RuntimeInfoContributor.
• Extends the Info endpoint sample JSON output to include the new runtime section with the documented properties.
• Updates the build-and-stage workflow to newer major versions of core GitHub Actions and expands the set of installed .NET SDK versions.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
docs/docs/v4/management/info.md	Documents the RuntimeInfoContributor and its properties and updates the sample Info actuator JSON to include a runtime object.
.github/workflows/build-and-stage.yml	Bumps actions/checkout, actions/setup-dotnet, and actions/upload-artifact versions and configures the workflow to install .NET SDKs 8.0, 9.0, and 10.0.

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