Add DB migration for alumnigraph

uwsgi-python/tasks/apps/alumnigraph.yml

+---
+
+# https://github.com/ansible/ansible/issues/42983
+- name: ensure there exists a .ansible folder
+  file:
+    path: "{{app_path}}/.ansible"
+    state: directory
+    owner: "{{app_user}}"
+    group: "{{app_group}}"
+
+- name: ensure data model upgrades are applied  # noqa 301
+  shell: "FLASK_APP={{app_program}} {{app_venv}}/bin/flask db upgrade"
+  args:
+    chdir: "{{app_path}}"
+  become: true
+  become_user: "{{app_user}}"
+  notify:
+    - "restart uwsgi instance {{app.instance}}"
+
+- name: ensure the folder from above is not present anymore
+  file:
+    path: "{{app_path}}/.ansible"
+    state: absent