Add mailman3 API auth to account-automation config

roles/account-automation-common/vars/main.yml

@@ -14,6 +14,8 @@ account_automation_config:
   cold_storage_upload_url: "{{ cold_storage_upload_url | default('') }}"
   redis_password: "{{ redis_password }}"
   frontend_ip_addrs: "{{ services['frontend'].hosts | map('extract', hostvars) | map(attribute='ips') | flatten | sort | list }}"
+  mailman3_admin_user: "admin"
+  mailman3_admin_password: "{{ mailman_rest_password }}"
   mailer_params:
     gpg_key_id: "{{ account_automation_gpg_key_id | default('') }}"
     gpg_homedir: "/etc/ai/gpg"