Whats is image:tag in docker-compose.override.yml

I am trying do deploy my chatbot using docker-compose.

I am not familiar with docker yet, so sorry if my question is very stupid.

I do not know what to write into the docker-compose.override.yml file where is says image:tag.

The docker image is created via github action and pushed to my dockerhub repository. I tried a couple of things but I do not know how to reference it.

Turns out that image:tag can be replaced by <account_name/repository/tag>. Another problem was that my dockerhub was set to private which requires additional secrets. Just setting it to public worked fine.