Setup mailman3 server

We want to migrate to mailman3 as mailman2 is basically unmaintained and requires Python 2 which is EOL.

Because the mailman and mailman3 packages conflict and we don't want to perform a big bang migration, mailman3 must be deployed on a separate server. mailman-web (mailman3's web interface) hasn't been packaged yet, so for now we are using my homebrewed PKGBUILD.

[1] https://gist.github.com/klausenbusk/5982063f95c503754a51ed2fefb8915e

Ref #59 (closed)

---

Migrated lists:

• arch-announce
• arch-devops-private
• arch-events
• arch-wiki-admins

roles/mailman3/tasks/main.yml

@@ -8,8 +8,8 @@
   loop:
     - {src: mailman.cfg.j2, dest: /etc/mailman.cfg, group: mailman}
     - {src: mailman-hyperkitty.cfg.j2, dest: /etc/mailman-hyperkitty.cfg, group: mailman}
-    - {src: settings.py.j2, dest: /etc/mailman3/settings.py, group: mailman-web}
-    - {src: urls.py.j2, dest: /etc/mailman3/urls.py, group: mailman-web}
+    - {src: settings.py.j2, dest: /etc/webapps/mailman-web/settings.py, group: mailman-web}
+    - {src: urls.py.j2, dest: /etc/webapps/mailman-web/urls.py, group: mailman-web}
   notify:
     - reload mailman
     - restart mailman-web
@@ -46,7 +46,7 @@
   become_method: su
 
 - name: run Django management tasks
-  command: django-admin {{ item }} --pythonpath /etc/mailman3 --settings settings
+  command: django-admin {{ item }} --pythonpath /etc/webapps/mailman-web --settings settings
   loop:
     - migrate
     - loaddata