[CI] - 429 Too Many Requests

[mitchdz]

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Describe the bug

Problem

Our workflows make many requests to GHCR. This gets frequently rate limited.

See https://github.com/NVIDIA/cuda-quantum/actions/runs/22109358500/job/63901118985#step:11:314

#30 [prereqs 20/21] ADD .git/index /cuda-quantum/.git/index
#30 ERROR: failed to copy: httpReadSeeker: failed open: unexpected status code https://ghcr.io/v2/nvidia/buildcache-cuda-quantum-merge-group-assets-prereqs-cu12-6-llvm-arm64/blobs/sha256:f6d240177c52f64e99f6e65d17a5ccaa4e67a79a92a25789dd5d56c05da7e41b: 429 Too Many Requests - Server message: toomanyrequests: retry-after: 333.939671ms

Steps to reproduce the bug

Run multiple PRs/merge-queues at once.

Expected behavior

No rate limiting.

Is this a regression? If it is, put the last known working version (or commit) here.

Not a regression

Environment

CI

Suggestions

Maybe use multiple tokens, or different registries?