feat(git): Add 'pull.rebase' flag

Signed-off-by: Jeremy MAURO <jeremy.mauro@gmail.com>

cookbooks/workstation/attributes/_git.rb

@@ -21,6 +21,7 @@ default['workstation']['_git']['system'] = {
   'include.path': '~/.gitconfig',
   'user.email': "jeremy@#{node['hostname']}",
   'user.name': 'Jeremy from WSL2',
+  'pull.rebase': 'preserve',
 }
 
 # We don't use hash because keys such as "includeif.gitdir" are not uniq