Metadata descriptors

[LaurentGoderre]

This PR allows outputting all the descriptors in the metadata file. This is how it would look:

"containerimage.descriptors": [
    {
      "mediaType": "application/vnd.oci.image.index.v1+json",
      "digest": "sha256:09ebf864af696306655197662bac5fc5d249e273223bf0c02df053c5b969e723",
      "size": 1607,
      "annotations": {
        "org.opencontainers.image.created": "2024-10-28T13:41:56Z"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.manifest.v1+json",
      "digest": "sha256:465f515dfba9a241c3af16b4154e4161db1e8de1055b753434874158e7ae05d9",
      "size": 480,
      "platform": {
        "architecture": "amd64",
        "os": "linux"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.config.v1+json",
      "digest": "sha256:e75ff1d806b99c41ff0f797f6800a85546d5ebf447d69796ec1db166809a41a2",
      "size": 585
    },
    {
      "mediaType": "application/vnd.oci.image.manifest.v1+json",
      "digest": "sha256:6769e746bda352f77bbc473606b8e55bed52a2e091d7bba0d953aba8915410ac",
      "size": 480,
      "platform": {
        "architecture": "arm64",
        "os": "linux"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.config.v1+json",
      "digest": "sha256:1c1104847de44646826edc258cfc23c4955f05ab2110d6aa1944ee283f993bb2",
      "size": 585
    },
    {
      "mediaType": "application/vnd.oci.image.manifest.v1+json",
      "digest": "sha256:a8287ced569f2ab73e293791fcab87478106a5b87eda2567ada9341c675f52c2",
      "size": 838,
      "annotations": {
        "vnd.docker.reference.digest": "sha256:465f515dfba9a241c3af16b4154e4161db1e8de1055b753434874158e7ae05d9",
        "vnd.docker.reference.type": "attestation-manifest"
      },
      "platform": {
        "architecture": "unknown",
        "os": "unknown"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.manifest.v1+json",
      "digest": "sha256:c844cf966bdfe7d63e4b87f69b66238fe0e8e42539faa3240258b07f3e85d45d",
      "size": 838,
      "annotations": {
        "vnd.docker.reference.digest": "sha256:6769e746bda352f77bbc473606b8e55bed52a2e091d7bba0d953aba8915410ac",
        "vnd.docker.reference.type": "attestation-manifest"
      },
      "platform": {
        "architecture": "unknown",
        "os": "unknown"
      }
    }
]

[tonistiigi]

Check the CI errors