feat: add login page with SecurityController

src/Controller/HomepageController.php

@@ -18,7 +18,7 @@ class HomepageController extends AbstractController
         private readonly ActorRepository $actorRepository
     ) {}
 
-    #[Route('/')]
+    #[Route('/', name: 'app_homepage')]
     public function index(SerializerInterface $serializer): Response
     {
         // Final actor to be guessed

src/Controller/SecurityController.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Controller;
+
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Attribute\Route;
+use Symfony\Component\Security\Http\Authentication\AuthenticationUtils;
+
+class SecurityController extends AbstractController
+{
+    #[Route('/login', name: 'app_login')]
+    public function login(AuthenticationUtils $authenticationUtils): Response
+    {
+        if ($this->getUser()) {
+            return $this->redirectToRoute('app_homepage');
+        }
+
+        return $this->render('security/login.html.twig', [
+            'last_username' => $authenticationUtils->getLastUsername(),
+            'error' => $authenticationUtils->getLastAuthenticationError(),
+        ]);
+    }
+
+    #[Route('/logout', name: 'app_logout')]
+    public function logout(): void
+    {
+        throw new \LogicException('This method can be blank - it will be intercepted by the logout key on your firewall.');
+    }
+}