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docs: note docker driver attestation limits #25753

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bbce6fc
docs: note docker driver attestation limits
locker95 Aug 10, 2026
b18ab55
docs: fix attestation note link targets
locker95 Aug 10, 2026
fecedf6
docs: use site-relative paths for attestation note links
locker95 Aug 10, 2026
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10 changes: 10 additions & 0 deletions content/manuals/build/metadata/attestations/_index.md
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Expand Up @@ -83,6 +83,16 @@ the attestations to an image manifest, since it's outputting a directory of
files or a tarball, not an image. Instead, these exporters write the
attestations to one or more JSON files in the root directory of the export.

> [!NOTE]
>
> Attestations also depend on the build **driver** and image store, not only the
> exporter. The `docker` driver with the classic image store can't produce image
> attestations (`ERROR: Attestation is not supported for the docker driver`).
> Use the containerd image store, switch to a driver such as `docker-container`,
> or disable attestations for that build. See
> [Build drivers](/build/builders/drivers/) and
> [containerd image store](/engine/storage/containerd/).

## Example

The following example shows a truncated in-toto JSON representation of an SBOM
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