mail: run migration script after creating db

roles/mail/tasks/main.yml

@@ -137,6 +137,7 @@
   postgresql_db: name={{ mailman3web_dbname }} owner={{ mailman3_dbuser }}
   become: true
   become_user: postgres
+  register: mailman_createdb
 
 - name: Configure mailman3
   template: src=mailman/mailman.cfg.j2 dest=/etc/mailman3/mailman.cfg
@@ -146,6 +147,12 @@
   template: src=mailman/mailman-web.py.j2 dest=/etc/mailman3/mailman-web.py
   notify: Restart mailman3web
 
+- name: Run mailman3-web migration script
+  command:
+    cmd: ./manage.py migrate
+    chdir: /usr/share/mailman3-web
+  when: mailman_createdb.changed
+
 - name: Create postfix ssl directory
   file: path=/etc/postfix/ssl state=directory mode=0750 owner=postfix group=postfix