[DEVOPS] [DOC] Improve doc build process

[codingwithmagga]

DevOps Request

The documentation process is always triggered when active, which means that doxysphinx and sphinx will always be executed.

Description of the proposed solution

The targets should only be build when necessary.

Additional context

Take a look at https://github.com/codingwithmagga/doxysphinx-with-read-the-docs-template?tab=readme-ov-file.