feat(discord): register health check hosted service in Program.cs

Issue #32

src/GmRelay.DiscordBot/Program.cs

@@ -2,6 +2,7 @@ using GmRelay.DiscordBot;
 using GmRelay.DiscordBot.Features.Sessions;
 using GmRelay.DiscordBot.Infrastructure;
 using GmRelay.DiscordBot.Infrastructure.Discord;
+using GmRelay.DiscordBot.Infrastructure.Health;
 using GmRelay.DiscordBot.Infrastructure.Logging;
 using GmRelay.Shared.Features.Confirmation.HandleRsvp;
 using GmRelay.Shared.Features.Confirmation.SendConfirmation;
@@ -73,6 +74,7 @@ builder.Services.AddSingleton<HandleRsvpHandler>();
 builder.Services.AddSingleton<RescheduleVotingFinalizer>();
 builder.Services.AddHostedService<SessionSchedulerService>();
 builder.Services.AddHostedService<DiscordRescheduleVotingDeadlineService>();
+builder.Services.AddHostedService<DiscordHealthCheckHostedService>();
 
 builder.Services
     .AddDiscordGateway(options =>

tests/GmRelay.Bot.Tests/Discord/DiscordStartupTests.cs

@@ -87,6 +87,14 @@ public sealed class DiscordStartupTests
         Assert.Contains("HandleRsvpHandler", program);
     }
 
+    [Fact]
+    public void Program_ShouldRegisterDiscordHealthCheckHostedService()
+    {
+        var program = ReadProgram();
+        Assert.Contains("DiscordHealthCheckHostedService", program);
+        Assert.Contains("AddHostedService<DiscordHealthCheckHostedService>", program);
+    }
+
     private static string ReadProgram()
     {
         var repoRoot = GetRepoRoot();