Add field pubkey in signup form

src/Account/views/signup.twig

@@ -5,6 +5,7 @@
     <form action="{{ path('account.signup') }}" method="post">
       {{ csrf_input() }}
       {{ field('username', user.username, "Pseudo") }}
+      {{ field('pubkey', user.pubkey, "Clé publique") }}
       {{ field('firstname', user.firstname, "Prénom") }}  {{ field('lastname', user.lastname, "Nom") }}
       {{ field('email', user.email, "Email", {type: 'email'}) }}
       {{ field('password', null, "Mot de passe", {type: 'password'}) }}
@@ -13,4 +14,4 @@
       <button class="btn btn-primary">S'inscrire</button>
     </form>
   </div>
-{% endblock %}
+{% endblock %}