Fix possible hidden exceptions

If an error occurred while starting the server which in turn caused an
exception in the dispose method of the apphost, the first exception
wouldn't get logged.

Jellyfin.Server/Program.cs

@@ -150,14 +150,15 @@ namespace Jellyfin.Server
                 _logger.LogWarning("Failed to enable shared cache for SQLite");
             }
 
-            using (var appHost = new CoreAppHost(
+            var appHost = new CoreAppHost(
                 appPaths,
                 _loggerFactory,
                 options,
                 new ManagedFileSystem(_loggerFactory.CreateLogger<ManagedFileSystem>(), appPaths),
                 new NullImageEncoder(),
                 new NetworkManager(_loggerFactory.CreateLogger<NetworkManager>()),
-                appConfig))
+                appConfig);
+            try
             {
                 await appHost.InitAsync(new ServiceCollection()).ConfigureAwait(false);
 
@@ -165,15 +166,20 @@ namespace Jellyfin.Server
 
                 await appHost.RunStartupTasksAsync().ConfigureAwait(false);
 
-                try
-                {
-                    // Block main thread until shutdown
-                    await Task.Delay(-1, _tokenSource.Token).ConfigureAwait(false);
-                }
-                catch (TaskCanceledException)
-                {
-                    // Don't throw on cancellation
-                }
+                // Block main thread until shutdown
+                await Task.Delay(-1, _tokenSource.Token).ConfigureAwait(false);
+            }
+            catch (TaskCanceledException)
+            {
+                // Don't throw on cancellation
+            }
+            catch (Exception ex)
+            {
+                _logger.LogCritical(ex, "Error while starting server.");
+            }
+            finally
+            {
+                appHost?.Dispose();
             }
 
             if (_restartOnShutdown)