Introduce a new CI image with Debian slim
From Draft to Ready
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!731 (merged) is merged
Context
- Follow-up of !709 (merged)
- Pre-requisite step to #129
What does this MR do and why?
This MR introduces debian OS in slim version to experiment with using this hopefully smaller image in the CI.
Once we use that image in the CI, we'll be able to just remove the regular "debian:bullseye" version.
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 David Dieulivol