Adds support for SBOM attestations #1225
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Summary
This PR adds a
sbomoption in the builder config. You can usesbom: trueto have the Docker buildx include--sbom=true, so that the generated image includes SBOM Attestations. This is helpful, as Docker Scout includes a default policy rule of "Missing supply chain attestation(s)" which fails for the rule "SBOM attestation (https://spdx.dev/Document) exists" for images generated by Kamal.Related information
This PR is modeled after the merged PR #972 that introduced
provenanceattestations.