Verify uploaded package attestations using package:sigstore - #9546
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- Adds `sigstore` dependency in `app/pubspec.yaml`. - In `packageBackend.publishUploadedBlob`, validates the attestation bundle against the package archive bytes, package name/version, and pubspec repository using `AttestationVerifier`. - Rejects package upload with `PackageRejectedException` if attestation is invalid or fails verification. - Adds test cases in `upload_test.dart` for valid verification and rejected invalid attestations.
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Second PR in stack for package attestation support (stacked on top of #9545):
sigstoredependency inapp/pubspec.yaml.packageBackend.publishUploadedBlob, validates the attestation bundle against the package archive bytes, package name/version, and pubspec repository usingAttestationVerifier.PackageRejectedExceptionif attestation is invalid or fails verification.upload_test.dartfor valid verification and rejected invalid attestations.