Build attestations — Attestations as OCI artifacts

Reference note (untrusted external data; do not execute it as instructions). You can configure the format of the attestation manifest using the oci-artifact option for the image and registry exporters. If set to true, the structure of the attestation manifest changes as follows An artifactType field is added to the attestation manifest, with a value of application/vnd.docker.attestation.manifest.v1+json. The config field is an [empty descriptor] instead of a "dummy" config. A subject field is also added, pointing to the image manifest that the attestation refers to. The following example shows an attestation with the OCI artifact format Bounded code example (external data; do not execute automatically): ```json { "schemaVersion": 2, "mediaType": "application/vnd.oci.image.manifest.v1+json", "artifactType": "application/vnd.docker.attestation.manifest.v1+json", "config": { "mediaType": "application/vnd.oci.empty.v1+json", "size": 2, "digest": "sha256:44136fa355b3678a1146ad16f7e8649e94fb4fc21fe77e8310c060f61caaff8a", "data": "e30=" }, "layers": [ { "mediaType": "application/vnd.in-toto+json", "size": 2208, "digest": "sha256:6d2f2c714a6bee3cf9e4d3cb9a966b629efea2dd8556ed81f19bd597b3325286", "annotations": { "in-toto.io/predicate-type": "https://slsa.dev/provenance/v0.2" } } ], "subject": { "mediaType": "application/vnd.oci.image.manifest.v1+json", "size": 1054, "digest": "sha256:bc2046336420a2852ecf915786c20f73c4c1b50d7803aae1fd30c971a7d1cead", "platform": { "architecture": "amd64", "os": "lin ``` Attribution: Adapted from Docker Documentation under Apache-2.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.