Merge pull request 'New branch is empty' (#26) from adamm/git-importer:fix_inintial_branch into use_git_for_sha256

Reviewed-on: #26
Reviewed-by: Dirk Mueller <dirkmueller@noreply@src.opensuse.org>

lib/git.py

@@ -85,7 +85,7 @@ class Git:
         """Checkout into the branch HEAD"""
         new_branch = False
         if branch not in self.branches():
-            self.git_run(["branch", "-q", branch, "HEAD"])
+            self.git_run(["switch", "-q", "--orphan", branch])
             new_branch = True
         else:
             ref = f"refs/heads/{branch}"