How to setup github actions runner?

Question

GitHub

Hey, has anyone already set up Github actions for real projects? To deploy to digital ocean, you need to install a special runner .

It has a _work folder in which it puts its working and temporary files, and already inside this folder there is a folder with a project.

This is not very convenient, since I would like to store application files in a separate folder. Anyone set it up?

By the way, so far I have seen information that there can only be one runner on the server, and one runner can serve only one repository. Is it still relevant? No way to set up CI/CD on one machine for multiple repos?