Acess other project container registry with gitlab ci

I have 2 private project
In both of them with each new version there will be created a new image in container registry
My question is:
How to access container registry of second project from first in gitlab-ci?
I have to have both of them in order to perform end-to-end tests. I have searched documentation but solution doesn’t appear before me.

I want to add second project container as service in one of the stages.

Any solution to it , i am not able pull docker image in another project container registry. Not able to fetch image aready created in another project.

For cloud gitlab you can try Pulling Docker image from GitLab Container Registry stopped working, only for one project - #10 by oleksiy