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

docs/otp.md

@@ -50,6 +50,19 @@ You can then run
 
 to generate a token to log in.
 
+## Rsync.net
+
+Run
+
+    pass otp insert -i rsync.net -a archlinux Rsync.net/archlinux-master-token -s
+
+When asked for a secret, provide the `2FA token seed` from `group_vars/all/vault_rsync.net.yml`.
+You can then run
+
+    pass otp code Rsync.net/archlinux-master-token
+
+to generate a token to log in.
+
 ### Adding your own account
 
 Hetzner supports multiple 2FA devices at once which allows you to add your own 2FA app of choice