Fetch usernames for U7 each time space is called

app.py

@@ -18,7 +18,6 @@ def pass_emoji(passed):
 api = HfApi()
 USERNAMES_DATASET_ID = "huggingface-course/audio-course-u7-hands-on"
 HF_TOKEN = os.environ.get("HF_TOKEN")
-U7_USERNAMES = hf_hub_download(USERNAMES_DATASET_ID, repo_type = "dataset", filename="usernames.csv", token=HF_TOKEN)
 
 
 def get_user_models(hf_username, task):
@@ -201,7 +200,8 @@ def certification(hf_username):
             unit["passed"] = pass_emoji(unit["passed_"])
         except: print("Either no relevant models found, or no metrics in the model card for automatic speech recognition")
       case "demo":
-        u7_users = pd.read_csv(U7_USERNAMES)
+        u7_usernames = hf_hub_download(USERNAMES_DATASET_ID, repo_type = "dataset", filename="usernames.csv", token=HF_TOKEN)
+        u7_users = pd.read_csv(u7_usernames)
         if hf_username in u7_users['username']:
             unit["best_result"] = 0
             unit["best_model_id"] = "Demo check passed, no model id"