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BuildKit's default image exporter does not set `artifactType` or the OCI 1.1 Referrers `subject` backlink on attestation manifests. Setting `oci-artifact=true` on the image exporter adds both, so SBOM and provenance attestations become discoverable through the OCI Referrers API. `oci-mediatypes=true` is redundant (BuildKit already defaults it to true when pushing to a registry, which is why the top-level index is already `application/vnd.oci.image.index.v1+json`) but kept for clarity. Same fix as cloudnative-pg/cloudnative-pg#10601, mirroring cloudnative-pg/postgres-extensions-containers#198. Closes #436 Signed-off-by: Gabriele Bartolini <[email protected]>
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BuildKit's default image exporter does not set
artifactTypeor the OCI 1.1 Referrerssubjectbacklink on attestation manifests. Settingoci-artifact=trueon the image exporter adds both, so SBOM and provenance attestations become discoverable through the OCI Referrers API.oci-mediatypes=trueis redundant (BuildKit already defaults it to true when pushing to a registry, which is why the top-level index is alreadyapplication/vnd.oci.image.index.v1+json) but kept for clarity.Same fix as cloudnative-pg/cloudnative-pg#10601, mirroring cloudnative-pg/postgres-extensions-containers#198.
Closes #436