release-20.2: docker: Base the docker image on RedHat UBI #55130
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Backport 1/1 commits from #54812.
/cc @cockroachdb/release
Before: The docker image was based on Debian 9.12 slim.
Why: This change will help on-prem customers from a security and
compliance perspective. It also aligns with our publishing images into
the RedHat Marketplace.
Now: Published docker images are based on the RedHat UBI 8 base image.
Fixes: #49643
Release note (backward-incompatible change): CockroachDB Docker images
are now based on the RedHat ubi8/ubi base image instead of Debian 9.12
slim. This will help on-prem customers from a security and compliance
perspective.