Smoke platform child digests on Docker classic image storage - #40
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The release smoke fails on the GitHub runner’s Docker Engine 28 classic image store: pulling amd64 and then arm64 under the same multi-platform index reference produces
cannot overwrite digest. Docker Desktop’s image store accepts this sequence, so local smoke had passed.Resolve each platform’s child digest from the content-verified, signed index and use that reference for both pull and run. Apply this to the local site/MCP pair and the anonymous default-source smoke. Publication still verifies and promotes the common index; missing, duplicate, or invalid platform descriptors fail closed.
Validation: reproduced the original error on an isolated Docker Engine 28.0.4 with Compose 2.38.2, then pulled and started both platforms successfully using child digests. Both published architectures passed the local MCP tool smoke. All 54 publication tests, actionlint, and diff checks passed. Added coverage for index integrity, descriptor selection, and platform-specific pull/run references.