Speed-up `linux_web_engine_test` LUCI build
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P1
team-infra
triaged-infra
- Dominant language
- Dart
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Description
Mirrored from b/520537519. - `linux_web_engine_test` and several other tests are taking a long time to "mount caches".
1. What are these caches? builder and git caches are rebuilt every 4 hours.
2. What is in these caches? fuchsia sdk in our caches consumes 160GB - but a fresh gclient sync is only 12GB.
3. Can we layer these caches? (Don't download fuchsia on bots when its not needed)
We need to understand the recipe that creates these caches and what the previous team was trying to do, then we should decide if we need to build something else (e.g. OCI layering / docker).
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