drop sha specification

src/backend.py

@@ -142,7 +142,7 @@ def _backend_routine():
     pending_models = list(set(rl_models) - set(evaluated_models))
     pending_and_compatible_models = []
     for repo_id, sha in pending_models:
-        filenames = [sib.rfilename for sib in API.model_info(repo_id, revision=sha).siblings]
+        filenames = [sib.rfilename for sib in API.model_info(repo_id, revision="main").siblings]
         if "agent.pt" in filenames:
             pending_and_compatible_models.append((repo_id, sha))