Introduce a report-built-images job to gather the list of all built images
What does this MR do and why?
This is useful to have a quick view of all the images built in a pipeline, e.g. https://gitlab.com/gitlab-org/gitlab-build-images/-/jobs/6987026593.
Checklist
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(If applicable) Add patches if required for upgrading Ruby version in https://gitlab.com/gitlab-org/gitlab-build-images/-/tree/master/patches/ruby.
Edited by Rémy Coutable