chore(ci): add partition layer balancer - #8419
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Add a resumable workflow for copying contiguous commercial layer histories into China and GovCloud with separate partition credentials. Validate version position, content hashes, public permissions, and target identity before publishing. Serialize existing partition writers with the balancer to protect layer version ordering. Fixes #8418
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Issue number: closes #8418
Summary
Changes
Add a generic
Layer Balancer (Partitions)workflow for copying a contiguous commercial layer history into AWS China or GovCloud with separate partition credentials. The workflow defaults to dry-run, validates the target account and version position, preserves source version numbers, verifies SHA values and public permissions, and safely resumes partial runs.Add a shared concurrency group to existing partition publishers so a deployment cannot change layer version ordering while a balance run is active.
User experience
Maintainers can bring a new Python runtime up to the existing partition version before returning to the regular
Layer Deployment (Partitions)workflow. Existing deployment behavior is unchanged except that conflicting partition writes are queued rather than run concurrently.By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.
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