Document Docker CI bucket output (#4)

- Document Docker CI bucket output (b7c2a940d0eefe9492f652d9abfa9232c76eb1e8)

README.md

@@ -131,6 +131,7 @@ The bucket uses the following layout:
 ```text
 github_actions/
 ├── boost/predicted_labels/
+├── docker/saved_model/
 ├── prediction/predicted_labels/
 ├── train/saved_model/
 └── tta/predicted_labels/