dashboard@158f41d372e6

This is not an image: it is a BuildKit attestation entry of a multi-arch index.

docker buildx stores the attestations it generates as an extra entry of the index, with the placeholder platform unknown/unknown, describing the variant 9c4384dcfce5. It appears whenever a build records provenance — on by default since Docker 24 / buildx 0.11 — or an SBOM (--sbom=true); images built with plain docker build or with --provenance=false have no such entry. docker pull never fetches it by itself; docker buildx imagetools inspect and docker sbom read it.

This entry contains: SLSA provenance v1 (31.4 KiB) — no SBOM: the build did not pass --sbom=true.

It belongs to dashboard:0.8.0, dashboard@10253d29f665, so it cannot be deleted on its own: removing it would break that index. Delete the tag or the index and the next prune untagged run (or a retention policy) removes this entry; garbage collection reclaims its bytes.

To build without attestation entries: docker buildx build --provenance=false --sbom=false …

docker pull chicor.ee/tund/dashboard@sha256:158f41d372e6807f351ab528fed8d8a5077eeb3c233bc49ae390a0acee604a6d

Digest: 158f41d372e6807f351a
Media type: application/vnd.oci.image.manifest.v1+json
Platform: none — attestation entry (unknown/unknown)
Total size: 31.4 KiB
Pushed: Oct 6, 2026byGitHub Actions · tund/github-ci

Cargo plan

1 layer31.4 KiB

#	Instruction	Digest	Shared	Size
1	`—`	8611dbe77047	unique	31.4 KiB

{
  "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",
    "digest": "sha256:44136fa355b3678a1146ad16f7e8649e94fb4fc21fe77e8310c060f61caaff8a",
    "size": 2,
    "data": "e30="
  },
  "layers": [
    {
      "mediaType": "application/vnd.in-toto+json",
      "digest": "sha256:8611dbe770471f743c9f88f576c0622061afcb63aae96cd7554f248158d61965",
      "size": 32120,
      "annotations": {
        "in-toto.io/predicate-type": "https://slsa.dev/provenance/v1"
      }
    }
  ],
  "subject": {
    "mediaType": "application/vnd.oci.image.manifest.v1+json",
    "digest": "sha256:9c4384dcfce539cdb63b07dc8b121ac3be8ba22ee2a68d035dce3ce8f2fcd46b",
    "size": 1813
  }
}