[ci] Distribute immutable workflow artifacts - #3508
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This was referenced Jul 31, 2026
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## main #3508 +/- ##
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Build and export the CI Docker image once, upload its gzip-layer archive directly, and have every matrix cell select that exact artifact by the producer-generated ID. Load and validate the image locally, then remove the archive immediately. This eliminates per-cell Buildx setup, registry login, and cache reconstruction while preserving fork behavior. Apply the same immutable-ID contract to the Anneal toolchain fan-out. Upload both already-compressed files without a redundant ZIP, centralize their filenames, and validate upload metadata, download selectors, file shape, digest, and rerun overwrite behavior in shared local actions. The current Docker cache contains 1,275,967,148 compressed bytes. A representative 60-cell hosted PR spent 3,265 aggregate seconds in per-cell Buildx and cache loading, averaging 54.4 seconds per cell. This change should remove repeated BuildKit bootstrap and cache-solve overhead; artifact transfer and docker load remain and require hosted follow-up measurement. gherrit-pr-id: Gr7m2v9k4x6c3p8s5d1f0h2j4l6n8q0w2
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Build and export the CI Docker image once, upload its gzip-layer archive
directly, and have every matrix cell select that exact artifact by
the producer-generated ID. Load and validate the image locally, then
remove the archive immediately. This eliminates per-cell Buildx setup,
registry login, and cache reconstruction while preserving fork behavior.
Apply the same immutable-ID contract to the Anneal toolchain
fan-out. Upload both already-compressed files without a redundant ZIP,
centralize their filenames, and validate upload metadata, download
selectors, file shape, digest, and rerun overwrite behavior in shared
local actions.
The current Docker cache contains 1,275,967,148 compressed bytes. A
representative 60-cell hosted PR spent 3,265 aggregate seconds
in per-cell Buildx and cache loading, averaging 54.4 seconds per
cell. This change should remove repeated BuildKit bootstrap and
cache-solve overhead; artifact transfer and docker load remain and
require hosted follow-up measurement.
Latest Update: v2 — Compare vs v1
📚 Full Patch History
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git fetch origin refs/heads/Gr7m2v9k4x6c3p8s5d1f0h2j4l6n8q0w2 && git checkout -b pr-Gr7m2v9k4x6c3p8s5d1f0h2j4l6n8q0w2 FETCH_HEADCheckout
git fetch origin refs/heads/Gr7m2v9k4x6c3p8s5d1f0h2j4l6n8q0w2 && git checkout FETCH_HEADCherry Pick
git fetch origin refs/heads/Gr7m2v9k4x6c3p8s5d1f0h2j4l6n8q0w2 && git cherry-pick FETCH_HEADPull
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