build: upgrade CUDA to 12.8, rust to nightly 2025-04-03#276
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Recent requirements to use ubuntu24.04 in kubernetes deployments of blitzar dependents have made it difficult or impossible to use CUDA 12.6. Nvidia does not provide an ubuntu24.04 driver image that is compatible with the current blitzar. Using CUDA 12.8 should resolve the issue.
tlovell-sxt
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stuarttimwhite
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Jun 11, 2026
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Rationale for this change
Recent requirements to use ubuntu24.04 in kubernetes deployments of blitzar dependents have made it difficult or impossible to use CUDA 12.6. Nvidia does not provide an ubuntu24.04 driver image that is compatible with the current blitzar. Using CUDA 12.8 should resolve the issue.
Also, due to some rust dependencies invalidating use of edition 2021 or pre-1.86, the rust overlay has also been upgraded.
What changes are included in this PR?
Are these changes tested?
These changes do not affect existing functionality, which should be verified by existing tests.