gitlab-ci: Consolidate container and build stages for LAVA

Tomeu Vizoso requested to merge tomeu/mesa:lava-ci-consolidation into master

Use the normal build job to also prepare the artifacts for LAVA jobs.

For that, the build container needs to also build the test suites, kernel, ramdisk, etc.

Then the build job will place the just-built Mesa in the ramdisk and the test job can generate a LAVA job and point to those artifacts.

Signed-off-by: Tomeu Vizoso

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