fix: use fresh Settings() in test, add LDAP_SEARCH_BASE to .env.example

.env.example

@@ -9,3 +9,4 @@ SECRET_KEY=changeme-replace-in-production
 # DATABASE_URL=mysql+pymysql://user:password@db:3306/efihub
 # SECRET_KEY=<python -c "import secrets; print(secrets.token_hex(32))">
 # LDAP_ENABLED=true
+# LDAP_SEARCH_BASE=OU=users,OU=EFI,OU=Faculties,DC=ADS1,DC=fh-nuernberg,DC=de

tests/test_config.py

@@ -1,8 +1,8 @@
-from app.core.config import get_settings
+from app.core.config import Settings
 
 
 def test_new_config_fields_have_defaults():
-    s = get_settings()
+    s = Settings()
     assert hasattr(s, "SECRET_KEY")
     assert hasattr(s, "LDAP_ENABLED")
     assert s.LDAP_ENABLED is False