fix(trigger.py): Fix build config parameter overwrite

We should not overwrite original build config, so on
next iteration we fetch fresh NIPA branch.

Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>

src/trigger.py

@@ -133,7 +133,8 @@ def _iterate_build_configs(self, force, build_configs_list,
                                timeout, trees):
         for name, config in self._build_configs.items():
             if not build_configs_list or name in build_configs_list:
-                self._run_trigger(config, force, timeout, trees)
+                cfg_copy = config.copy()
+                self._run_trigger(cfg_copy, force, timeout, trees)
 
     def _setup(self, args):
         return {