Make sure we're on main.

app.py

@@ -9,7 +9,7 @@ import os
 
 def greet(name):
     with tempfile.TemporaryDirectory() as d:
-        Repo.clone_from(name, d)
+        Repo.clone_from(name, d, branch="main")
         repo = Repo(d)
         for commit in repo.iter_commits():
             print(commit)