backend: require confirmation for signed channel updates [CI]

backend/src/MoShiro.Backend.Application/ApplicationServiceCollectionExtensions.cs

@@ -37,6 +37,8 @@ public static class ApplicationServiceCollectionExtensions
         services.AddSingleton<AuthService>();
         services.AddSingleton<SettingsService>();
         services.AddSingleton<ReleaseService>();
+        services.AddSingleton<BackendUpdates>();
+        services.AddHostedService(p => p.GetRequiredService<BackendUpdates>());
         services.AddSingleton<JoinTokenService>();
         services.AddSingleton<RawBrowserService>();
         services.AddSingleton<EventService>();