How to change DocumentRoot Docker + Apache?

Question

Apache HTTP Server

Hello.
There is a Yii2 advanced project, there are 2 folders in the root: 1) public_html, which contains our index.php and 2) the name of the project itself, which contains frontend and backend.
Now I am uploading this project locally to the docker, I need to configure routing to the public_html folder, as I understand it, specify the DocumentRoot in the conf. Apache2 file, but it's not clear to me how to do it. In OpenServer, everything was done quite easily - the path to the folder was specified in the domain settings and everything worked fine.