Add a more informative message for the lists closed signup state

roles/mailman/files/signup_closed.html

@@ -0,0 +1,21 @@
+{% extends "account/base.html" %}
+
+{% load i18n %}
+
+{% block head_title %}{% trans "Signup" %}{% endblock %}
+
+{% block content %}
+<h1>{% trans "Sign Up" %}</h1>
+
+<p>
+{% blocktrans %}
+Account creation for the Fedora mailing-lists is done by
+<a href="https://admin.fedoraproject.org/accounts/user/new">creating an account in FAS</a>.
+{% endblocktrans %}
+</p>
+
+{% url LOGIN_URL as login_url %}
+<p>{% blocktrans %}Already have an account? Then please <a href="{{login_url}}">sign in</a>.{% endblocktrans %}</p>
+
+
+{% endblock %}

roles/mailman/tasks/main.yml

@@ -400,6 +400,11 @@
         dest="{{ mailman_webui_basedir }}/templates/django_mailman3/login_extra_top.html"
   tags: mailman
 
+- name: install our fedora-specific signup_closed page
+  copy: src=signup_closed.html
+        dest="{{ mailman_webui_basedir }}/templates/account/signup_closed.html"
+  tags: mailman
+
 - name: Install our fedmenu js hook
   template: src=bottom.html
             dest="{{mailman_webui_basedir }}/templates/hyperkitty/bottom.html"