Update Debian base image to bullseye
What does this MR do?
This upgrades to bullseye, the latest stable version of Debian. It will upgrade OpenSSH to v8.4, which will enable "ecdsa-sk" and "ed25519-sk" SSH keys (https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/15171).
This is the second attempt (the first was reverted in !883 (merged)). The linker flags in !884 (merged) have been fixed for Ruby so that jemalloc will always handle malloc() instead of mixing calls in libc.
Related issues
https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/15171
Checklist
See Definition of done.
For anything in this list which will not be completed, please provide a reason in the MR discussion
Required
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Merge Request Title, and Description are up to date, accurate, and descriptive -
MR targeting the appropriate branch -
MR has a green pipeline on GitLab.com
Expected (please provide an explanation if not completing)
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Test plan indicating conditions for success has been posted and passes -
Documentation created/updated -
Integration tests added to GitLab QA -
The impact any change in container size has should be evaluated
Edited by Stan Hu