Readd the APP_SECRET value

Author: javiereguiluz

.env

@@ -16,7 +16,10 @@
 
 ###> symfony/framework-bundle ###
 APP_ENV=dev
-APP_SECRET=
+# in your own Symfony applications, you can leave this secret empty,
+# but in this example application, we need it so the application runs out of the box.
+# see https://symfony.com/blog/new-in-symfony-7-2-optional-secret
+APP_SECRET=2ca64f8d83b9e89f5f19d672841d6bb8
 ###< symfony/framework-bundle ###
 
 ###> doctrine/doctrine-bundle ###