For pre-merge pipelines, we know that we don't need to run the
container-check jobs unless image-tags.yml has been modified. In this
case, we can just skip the container jobs, because we 'know' that the
containers are present in the upstream repo.
For downstream or off-main pipelines, we still need to run the check
job, because the changed-file tracking is not reliable on other
branches, and because we may need to copy the container image from the
upstream container storage into the user's namespace.
Signed-off-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35203>
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