Merge patch series "Gitlab: Add a "sage-lab" stage to access a board farm"

This series adds support for Gitlab pipelines to run our pytest suite on
a limited number of hardware platforms. While better documentation and
some further enhancements will be coming soon, this can be triggered by
passing '-o ci.variable="SAGE_LAB=1"' to git push, or adding
'pushOption = ci.variable="SAGE_LAB=1"' to the .git/config file for the
project. It can also be invoked manually from the pipeline webpage on a
an existing pipeline.

Link: https://lore.kernel.org/r/20251118210015.624758-1-trini@konsulko.com

diff --cc .gitlab-ci.yml
Simple merge

diff --cc tools/docker/Dockerfile
Simple merge