Accept and expose package attestation bundles - #9545
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This was referenced Aug 19, 2026
- Adds `AssetKind.attestation` for storing attestation bundles as `PackageVersionAsset` entities in Datastore. - In `packageBackend.publishUploadedBlob`, checks for accompanying `tmp/<guid>.sigstore.json` in the incoming bucket, reads it, and saves it as an attestation asset. - Exposes `GET /api/packages/<package>/versions/<version>/attestation` endpoint for client retrieval. - Updates `PubApiClientExt` and adds unit tests in `upload_test.dart`.
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First PR in stack for package attestation support:
AssetKind.attestationfor storing attestation bundles asPackageVersionAssetentities in Datastore.packageBackend.publishUploadedBlob, checks for accompanyingtmp/<guid>.sigstore.jsonin the incoming bucket, reads it, and saves it as an attestation asset.GET /api/packages/<package>/versions/<version>/attestationendpoint for client retrieval.PubApiClientExtand adds unit tests inupload_test.dart.