[Enhancement] Swappable Packages (#216)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#216
Reviewed-by: liambrydon <lbry121@aucklanduni.ac.nz>
Reviewed-by: Tobias O <tobias.olenyi@envipath.com>

epdb/apps.py

@@ -1,4 +1,9 @@
+import logging
+
 from django.apps import AppConfig
+from django.conf import settings
+
+logger = logging.getLogger(__name__)
 
 
 class EPDBConfig(AppConfig):
@@ -7,3 +12,6 @@ class EPDBConfig(AppConfig):
 
     def ready(self):
         import epdb.signals  # noqa: F401
+
+        model_name = getattr(settings, "EPDB_PACKAGE_MODEL", "epdb.Package")
+        logger.info(f"Using Package model: {model_name}")