Add support for host IP binding in Aspire.Hosting.Docker port mappings

[alienwareone]

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

Currently there is no way to specify the host IP for ports in Aspire.Hosting.Docker. The .WithEndpoint() API only generates mappings such as "5001:5001" in docker-compose.yaml. There is no mechanism to bind a port to a specific IP (for example, "127.0.0.1:5001:5001"). This limitation prevents developers from restricting services to localhost or a particular interface.

https://docs.docker.com/reference/cli/docker/container/run/#publish
https://learn.microsoft.com/en-us/dotnet/aspire/get-started/docker-compose-to-apphost-reference#port-mappings

Describe the solution you'd like

public static IResourceBuilder<T> WithHostBinding<T>(this IResourceBuilder<T> builder, string hostAddress) where  : IComputeResource, IResourceWithEndpoints;

public static IResourceBuilder<T> WithLoopbackBinding<T>(this IResourceBuilder<T> builder) where  : IComputeResource, IResourceWithEndpoints
    => WithHostBinding(builder, "127.0.0.1");

Additional context

Workaround:

public static IResourceBuilder<T> WithHostBinding<T>(this IResourceBuilder<T> builder, string hostAddress) where T : IComputeResource, IResourceWithEndpoints
{
    return builder
        .WithExternalHttpEndpoints()
        .PublishAsDockerComposeService((resource, service) =>
        {
            for (var i = 0; i < service.Ports.Count; i++)
            {
                var port = service.Ports[i];

                if (!port.Contains(':'))
                {
                    port = $"{port}:{port}";
                }

                service.Ports[i] = $"{hostAddress}:{port}";
            }
        });
}