Using environment type to optionally enable key vault provider

Program.cs

using System;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Configuration.AzureKeyVault;

namespace Example
{
    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .ConfigureAppConfiguration((context, configBuilder) =>
                {            
                    var env = context.HostingEnvironment.EnvironmentName.ToLowerInvariant();
                    if (env != "development")
                    {
                        var config = configBuilder.Build();                       
                        configBuilder.AddAzureKeyVault(config["KeyVaultUrl"]);
                    }   
                });
    }
}