Missing docker image from documentation

[esteban-serfe]

I'm following the steps indicated here: https://deployer.org/docs/7.x/ci-cd#gitlab-cicd

But the docker image deployerphp/deployer:7 is not found ( see https://hub.docker.com/search?q=deployphp%2Fdeployer )

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[mfickers]

See #3118 for some suggestions of alternative images.

[Konafets]

As a workaround I installed Deployer globally via composer.