fix(deploy): error: The following untracked working tree files would be overwritten by checkout

fdroidserver/deploy.py

@@ -602,6 +602,7 @@ def update_servergitmirrors(servergitmirrors, repo_section):
             # Switch to the initial branch and unstage all files
             repo.head.reference = initial_branch_ref
             repo.head.reset(index=True, working_tree=False)
+            repo.delete_head(repo.branches[branch_name])
 
         if progress:
             progressbar.done()