Log github webhook secret when starting

So it can be quickly inspected and set on the github webhooks page

Author: kzu

src/Web/Program.cs

@@ -7,6 +7,7 @@
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using Microsoft.IdentityModel.JsonWebTokens;
 using Octokit.Webhooks;
@@ -102,4 +103,7 @@
     .ConfigureGitHubWebhooks(new ConfigurationBuilder().Configure().Build()["GitHub:Secret"])
     .Build();
 
+host.Services.GetRequiredService<ILogger<SponsorsManager>>()
+    .LogInformation($"Using GitHub:Secret {host.Services.GetRequiredService<IConfiguration>()["GitHub:Secret"]}");
+
 host.Run();