Explicitly set git init branch

Make main the default branch with git init as not all systems will
share the same default branch name value and Clear Linux uses main for
the package ecosystem.

Signed-off-by: William Douglas <william.douglas@intel.com>

autospec/git.py

@@ -29,7 +29,7 @@ from util import call, write_out
 def commit_to_git(config, name, success):
     """Update package's git tree for autospec managed changes."""
     path = config.download_path
-    call("git init", stdout=subprocess.DEVNULL, cwd=path)
+    call("git init -b main", stdout=subprocess.DEVNULL, cwd=path)
 
     # This config is used for setting the remote URI, so it is optional.
     if config.git_uri: