How to create Git submodule or commit object through gitlab API? Let me give an example Now there are two repositories in my gitlab server, namely `main` and `sub1`. I want to make `sub1` a sub-module of `main` should do this: ```shell git clone http://server/main.git cd main git submodule add http://server/sub1.git git add * git commit -m "add submodule" ``` Is there an API that allows me to send an HTTP request to achieve these operations.