Automatic C++ documentation generation on GitLab project using doxygen

I am working in a GitLab C++ project and I am trying to have a automatic documentation generation on the code using Doxygen. I don't really know how to approach the problem.

Can I somehow include it in CMake to have a updated documentation in the project everytime someone builds it?

Or would it be better to have the server generate a documentation when someone pushes his Code?

Thanks for your help!