Add bind mount for MASTER_PACKAGES_DIR

Packages mount is required for saving MTR logs

Author: RazvanLiviuVarzaru

master-migration/master.cfg

@@ -251,6 +251,7 @@ def ubasan_builder(name: str, debug: bool) -> GenericBuilder:
                     workdir=PurePath("/home/buildbot"),
                     bind_mounts=[
                         ("/srv/buildbot/ccache", "/mnt/ccache"),
+                        (f'{os.environ["MASTER_PACKAGES_DIR"]}/', "/packages"),
                     ],
                     shm_size="24g",
                     env_vars=[