GlitchTip: Add ansible task to create initial superuser

[magent-cryptograss]

Problem

GlitchTip deployment doesn't create an initial admin user. Currently relies on ENABLE_OPEN_USER_REGISTRATION: "True" and manual registration, which violates the no-touch server philosophy.

When we went to check error logs today, we found no users existed in GlitchTip at all.

Solution

Add an ansible task that creates a superuser idempotently:

- name: Create GlitchTip superuser
  command: >
    docker exec glitchtip-web ./manage.py shell -c
    "from django.contrib.auth import get_user_model; 
     User = get_user_model();
     User.objects.filter(email='{{ glitchtip_admin_email }}').exists() or 
     User.objects.create_superuser('{{ glitchtip_admin_email }}', '{{ glitchtip_admin_password }}')"
  changed_when: false

Store credentials in vault alongside other secrets.

Also consider

• Should we disable open registration once an admin exists?
• Configure real email (currently EMAIL_URL: "consolemail://" just logs to console)