build-push-to-dockerhub: Generate SBOM & attestations #120
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This generates an SBOM and provenance attestations. These are also stored in one of GitHub's SigStore instances, so the provenance of images built using this action can be verified. We delete the `syft-sbom-report` action. This wasn't a usable action (no `action.yaml`) anyway. What we do here is based on [a comment][comment] from one of the GitHub attestation folks. We only generate the provenance attestation with GitHub directly, and use Docker to generate the SBOM and another provenance attestation about the Dockerish bits of the build. The GitHub attestation acts as a signature over all of that, and should handle multi-arch manifests properly, which isn't possible with the documented GitHub way that exists currently. [comment]: actions/attest-sbom#60 (comment)
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This generates an SBOM and attestations for that SBOM and also build provenance. These are also stored in one of GitHub's SigStore instances, so the provenance of images built using this action can be verified.
We do this by repurposing the
syft-sbom-reportaction and calling that as a nested composite action, to encapsulate the generation and pushing work. This wasn't a usable action (noaction.yaml) anyway. It was already referencing theanchore/sbom-actionwe use here.