Add multilingual audit CI pipeline + extract mandelblog_content_guard

mandelblog_content_guard/signals.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+from functools import lru_cache
+
+from django.db.models.signals import pre_save
+from django.dispatch import receiver
+from wagtail.models import Page
+from wagtail.snippets.models import get_snippet_models
+
+from .validators.multilingual import validate_instance_or_raise
+
+
+@lru_cache(maxsize=1)
+def _snippet_models():
+    return tuple(get_snippet_models())
+
+
+def _is_snippet_instance(instance) -> bool:
+    instance_model = instance.__class__
+    return any(model == instance_model for model in _snippet_models())
+
+
+@receiver(pre_save)
+def enforce_multilingual_integrity(sender, instance, **kwargs):
+    if isinstance(instance, Page) or _is_snippet_instance(instance):
+        validate_instance_or_raise(instance)