Use Debian Stretch as base image
What does this MR do?
Pin the base image to a Debian 9 Strech derivative, instead of Buster.
By using this base image, we prevent the bug described in #13830 for users with Docker 19.03.00
(tested on my machine).
What are the relevant issue numbers?
refs https://gitlab.com/gitlab-org/gitlab-ee/issues/13830
Does this MR meet the acceptance criteria?
- [-] Changelog entry added
- [-] Documentation created/updated for GitLab EE, if necessary
- [-] Documentation created/updated for this project, if necessary
- [-] Documentation reviewed by technical writer or follow-up review issue created
- [-] Tests added for this feature/bug
- [-] Job definition updated, if necessary
- [-] Auto-DevOps template
- [-] Job definition example
- [-] CI Templates
- [-] Conforms to the code review guidelines
- [-] Conforms to the Go guidelines
-
Security reports checked/validated by reviewer