Add retry mechanism

this does not work for me, but is here as a record of what we have
tried.

ee/app/services/design_management/runs_design_actions.rb

@@ -2,13 +2,15 @@
 
 module DesignManagement
   module RunsDesignActions
+    MAX_TRIES = 3
+
     NoActions = Class.new(StandardError)
 
     # this concern requires the following methods to be implemented:
     #   current_user, target_branch, repository, commit_message
     #
     # @raise [NoActions] if actions are empty
-    def run_actions(actions)
+    def run_actions(actions, tries = MAX_TRIES)
       raise NoActions if actions.empty?
 
       repository.create_if_not_exists
@@ -18,6 +20,18 @@ def run_actions(actions)
                                     actions: actions.map(&:gitaly_action))
 
       ::DesignManagement::Version.create_for_designs(actions, sha)
+    rescue Gitlab::Git::CommandError => e
+      retry_or_fail(actions, e, tries)
+    end
+
+    private
+
+    def retry_or_fail(actions, error, tries)
+      if tries < MAX_TRIES
+        run_actions(actions, tries - 1)
+      else
+        raise error
+      end
     end
   end
 end