Adds pre-commit hook and CI step in test to ensure no migrations are missing

.github/workflows/tests.yml

@@ -59,6 +59,10 @@ jobs:
           pip install --upgrade pip
           pip install -r requirements/local.txt
 
+      - name: Check for missing migrations
+        run: |
+          python manage.py makemigrations --check --dry-run --noinput
+
       - name: Configure environment
         run: |
           echo "JWKS_BASE64=$(python manage.py generate_jwks)" >> $GITHUB_ENV

.pre-commit-config.yaml

@@ -34,3 +34,13 @@ repos:
       - id: flake8
         args: ["--config=.flake8"]
         additional_dependencies: [flake8-isort]
+
+  - repo: local
+    hooks:
+      - id: django-migrations-check
+        name: check django migrations
+        language: system
+        entry: .venv/bin/python manage.py makemigrations --dry-run --check --noinput
+        pass_filenames: false
+        exclude: migrations
+        types: [python]