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ci: GitHub's runners - #35
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devcontainer-cli is public: GitHub's standard runners are free there and have 4 vCPU, the Blacksmith size every job ran on (659 Blacksmith minutes in October). The release's buildx builder is Docker's own action; nothing here kept state between runs. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The TS reference builds a compose service from a Dockerfile it writes under /tmp, outside the build context; bake on buildx 0.38 (GitHub's runner image) refuses that without --allow=fs.read, which the reference never passes, and every compose case read as a divergence (run 40127656115). Confirmed on the runner: the same build passes with BUILDX_BAKE_ENTITLEMENTS_FS=0 (run 40129625428). Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
A step is one task (taskgate); ci:prepare-runner is where the runner is made ready for the parity lane, on both workflows. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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From the org CI audit of 2026-10-24. One hypothesis: a public repository's jobs cost nothing on GitHub's standard runners and lose nothing in speed at the same 4 vCPU.
Baseline (2026-09..10, blacksmith-4vcpu): Go CLI p50 7m19 (PR), parity-runtime shard p50 4m44 (n=144); 659 Blacksmith minutes in October.
Change: every
runs-ontoubuntu-latest; release.yml's Blacksmith builder todocker/setup-buildx-action(pinned v4.4.1). No cache depended on Blacksmith's disk here.Expected impact: Blacksmith minutes to 0; job durations within ±10% (same core count).
Validation:
gha_metrics.py --split-at <merge time>on 20 Go CLI runs each side.Revert: revert the commit.
🤖 Generated with Claude Code
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