fix: Require password env vars

app.py

@@ -73,8 +73,8 @@ def main():
         save_results_btn.click(fn=partial(save_results))
 
     auth = [
-        ("admin", os.getenv("ADMIN_PASSWORD")),
-        ("annika", os.getenv("ANNIKA_PASSWORD")),
+        ("admin", os.environ["ADMIN_PASSWORD"]),
+        ("annika", os.environ["ANNIKA_PASSWORD"]),
     ]
     demo.launch(auth=auth)