CliExtensions.cs

public static class CliCommandCollectionExtensions
{
    public static IServiceCollection AddCliCommands(this IServiceCollection services)
    {
        Type greetCommandType = typeof(DeployCommand);
        Type commandType = typeof(Command);

        IEnumerable<Type> commands = greetCommandType
            .Assembly
            .GetExportedTypes()
            .Where(x => x.Namespace == greetCommandType.Namespace && commandType.IsAssignableFrom(x));

        foreach (Type command in commands)
        {
            services.AddSingleton(commandType, command);
        }

        services.AddSingleton(sp =>
        {
            return
               sp.GetRequiredService<IConfiguration>().GetSection("Deployment").Get<DeploymentOptions>()
               ?? throw new ArgumentException("Deployment configuration cannot be missing.");
        });

        return services;
    }
}