Make database settings configurable

defaults/main.yml

@@ -15,6 +15,18 @@ mailman:
     change_pw: True
     ldap: False
     session_timeout: 3600
+    db:
+      ENGINE: django.db.backends.sqlite3
+      NAME: /var/lib/mailman3/web/mailman3web.db
+      USER: ''
+      PASSWORD: ''
+      HOST: ''
+      PORT: ''
+      OPTIONS: {}
+  db:
+    class: mailman.database.sqlite.SQLiteDatabase
+    url: 'sqlite:///$DATA_DIR/mailman.db'
+    debug: 'no'
   archiver:
     key: "{{ lookup('password', '/dev/null length=128') }}"
   list_defaults: