SIANXSVC-1186: Exit application after writing metadata

src/Anexia.E5E/Hosting/E5EHostWrapper.cs

@@ -35,21 +35,20 @@ public async Task StartAsync(CancellationToken cancellationToken = default)
 			return;
 		}
 
-		string metadata = "";
 #if NET8_0_OR_GREATER
-		metadata = JsonSerializer.Serialize(new E5ERuntimeMetadata(),
+		var metadata = JsonSerializer.Serialize(new E5ERuntimeMetadata(),
 			E5ESerializationContext.Default.E5ERuntimeMetadata);
 #else
-		metadata = JsonSerializer.Serialize(new E5ERuntimeMetadata(), E5EJsonSerializerOptions.Default);
+		var metadata = JsonSerializer.Serialize(new E5ERuntimeMetadata(), E5EJsonSerializerOptions.Default);
 #endif
 
 		_console.Open();
 		await _console.WriteToStdoutAsync(metadata).ConfigureAwait(false);
 		_console.Close();
 
-		// If we wrote the metadata, circumvent the default host mechanism as used by Run/RunAsync extensions
-		// and just stop the application.
-		_host.Services.GetRequiredService<IHostApplicationLifetime>().StopApplication();
+		// After we wrote the metadata, close the application immediately(!). Any startup tasks that occur after the startup
+		// (e.g. a long initialization task) won't be executed and the metadata is returned to e5e.
+		Environment.Exit(0);
 	}
 
 	public Task StopAsync(CancellationToken cancellationToken = default)