leave comment on storage setting in tests

tests/conftest.py

@@ -58,6 +58,8 @@ kwIDAQAB
 
 @pytest.fixture(autouse=True)
 def _test_settings(settings):
+    # We use `StaticFilesStorage` instead of `ManifestStaticFilesStorage` in tests
+    # since want stable filenames (`css/styles.css`) instead of hashed (`css/styles.55e7cbb9ba48.css`)
     settings.STORAGES = {
         "staticfiles": {
             "BACKEND": "django.contrib.staticfiles.storage.StaticFilesStorage"