We can use the init-stage1 script from the Mesa build artifacts instead of
keeping a copy in the lava-trigger container and inlining it into the
LAVA job definition.
v2 (Guilherme)
* Source the `init-stage1.sh` file instead of executing it
* Avoid hardcoding the run_steps asserts, check only the core parts
Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Co-authored-by: Guilherme Gallo <guilherme.gallo@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36549>
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