ci: add arm64 build cache and self-hosted runner cleanup#9
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- Registry-based build cache for arm64 QEMU cross-compilation - Cleanup steps on both jobs to prevent garbage accumulation - Remove temp ci-build image after amd64 push - Prune buildx cache and dangling images older than 72h Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Force Docker V2 media types (oci-mediatypes=false), disable SBOM attestations, and use gzip compression to avoid DockerHub rejecting large layer blobs from buildx. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
mode=max tries to push all layers (including multi-GB CUDA base) as cache, triggering DockerHub 400 errors. mode=min only caches final image layers. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The successful arm64 builds on Mar 16 had no registry cache. Removing cache-from/cache-to to verify the image push works without cache interference. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Registry cache (type=registry) triggers DockerHub 400 errors on large CUDA layers. GHA cache (type=gha) stores build cache in GitHub's blob storage, avoiding DockerHub entirely. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Registry cache triggers DockerHub 400 errors (buildx#271). Local cache on the self-hosted runner avoids network roundtrips entirely. - BuildKit GC capped at 20GB via maxUsedSpace - Cache rotated after each build to prevent unbounded growth - buildx prune --keep-storage 20g as safety net Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
buildcache-arm64tag on DockerHub, pulls on subsequent runs. Should cut the ~26min QEMU cross-compilation time significantly.Test plan
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