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Add a slim ruby image for gitlab

David Dieulivol requested to merge ddieulivol-create_smaller_container_image into master

Context

https://gitlab.com/gitlab-org/gitlab/-/jobs/4830787468#L6 took 52 seconds to download the default container image.

I'd like to have an image for "ruby-only jobs" that will be smaller to download when the runner needs to download the image from the registry.

I hope that the resulting image in this MR will be fairly small to download. If that's not the case, we can close this MR.

What does this MR do and why?

Adds a container image for gitlab-org/gitlab pipelines with ruby and debian-slim.

This container image is meant to be used for jobs that have to install ruby gems, sometimes from source, so they need the adequate OS dependencies installed (installed via https://gitlab.com/gitlab-org/gitlab-build-images/-/blob/master/Dockerfile.custom#L16).

They also need a small-ish image, so that the job can download the image faster than the regular image.

Results

Job: https://gitlab.com/gitlab-org/gitlab-build-images/-/jobs/4875094881:

Checklist

Edited by David Dieulivol

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