How to configure cache for docker executor in gitlab-runner?

Question

I've configured it for caching by referring to the official documentation, but now I don't know how I can use it in the .gitlab-ci.yml file. How do I go about writing the path to this path? config.toml

I don't know how I can use it in the .gitlab-ci.yml file. How do I go about writing the path to this path? .gitlab-ci.yml