Automation: how to use docker image from private project's package repository?

Hi,

Perhaps, I missed something, but I didn't found any example or guide how to use an image from Jetbrains package repository in an automation script.

Here is an example:
https://www.jetbrains.com/help/space/build-and-run-tests-in-gradle-project.html#build-the-project-and-run-tests-in-a-custom-container-image

also there are two env varaibles:

https://www.jetbrains.com/help/space/automation-environment-variables.html#authentication

But it's not clear how these vars should be assigned/used.

Do space automation job creates those credentials automatically ?
Should I login into project's package repository manually inside job ?

Finally it doesn't work for me:

job("Build and run tests") {
    container("mycompanynamehere.registry.jetbrains.space/p/xxx/xxx-containers/automation:1.0") {
        mountDir = "/mnt/space"
        workDir = "/mnt/space/work"

        kotlinScript { api ->
            api.gradlew("build --init-script $mountDir/system/gradle/init.gradle")
        }
    }
}

failed due to:

Container(s) failed to start: main: CannotPullContainerError: Error response from daemon: pull access denied for mycompanynamehere.registry.jetbrains.space/p/xxx/xxx-containers/automation, repository does not exist or may require 'docker login': denied: access to repository p/xxx