roles/archweb: Add the MAILMAN_PASSWORD to local_settings.py

Given spam attacks on arch-announce mail list, we have set a mailman poster password on
archweb. This adds the password to the vault and to local_settings.py

group_vars/all/vault_archweb.yml

 $ANSIBLE_VAULT;1.1;AES256
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roles/archweb/templates/local_settings.py.j2

@@ -63,6 +63,9 @@ MEDIA_URL = '/img/'
 # Make this unique, and don't share it with anybody.
 SECRET_KEY = '{{ vault_archweb_secret_key }}'
 
+# Mailman poster password for announcements
+MAILMAN_PASSWORD = '{{ vault_archweb_mailman_password }}'
+
 # Hostnames we allow this site to be served under
 ALLOWED_HOSTS = ['{{ archweb_domain }}']