ci: build release images one at a time and install cosign per runner - #1772
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…1770) The self-hosted runners share one host. Concurrent image jobs raced cosign's bootstrap download into the shared home directory (checksum failure on the v0.15.0 re-tag) and share one Docker credential file, which the first job to finish logs out of. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Follow-up to #1770 / #1771.
Problem
The re-tagged v0.15.0 release run (35840398289) got past the smoke test, but the jim-scheduler job then failed in
sigstore/cosign-installerwithUnable to validate cosign version: 'v2.6.1'. That message means the bootstrap binary it downloads failed its checksum. v0.15.0 is the first release on the self-hosted runners (since #1541), and those runners share one host: one Docker daemon, one Docker credential file and one home directory. The three image jobs ran at the same time, so:~/.cosign;docker/login-action's post-step logout on the shared~/.docker/config.json);Fix
max-parallel: 1onbuild-containers: images build one at a time. This closes the whole class of shared-host races, at the cost of a few minutes per release.${{ runner.temp }}/cosign(per runner) rather than the shared home directory.Evidence
max-parallelresolves to 1.Docs: n/a - CI only.
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