ci: Generate and sign provenance information as image layer for SLSA lvl 3 #504
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Configure docker buildx to generate provenance attestations as explained in https://docs.docker.com/build/metadata/attestations/slsa-provenance. Find the specific layer digest that corresponds to that provenance attestation, both for linux/amd64 and linux/arm64 architectures, and sign it. Signed-off-by: Víctor Cuadrado Juan <vcuadradojuan@suse.de>
This allows to test the CI workflows in a fork, and to not need push permissions to production OCI registry namespace under ghcr.io/kyverno. Signed-off-by: Víctor Cuadrado Juan <vcuadradojuan@suse.de>
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thanks for your effort @viccuad, will take a closer look today or tomorrow |
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Hi, this PR adds provenance information to the policy-reporter image as a layer, effectively raising its SLSA level to 3.
I've tried to be as less invasive as possible when adding this to the GHA workflow. In this PR:
ci: Generate and sign provenance info as image layer. Configure docker buildx to generate provenance attestations as explained in https://docs.docker.com/build/metadata/attestations/slsa-provenance.
Then, sign the provenance attestation layer. For that, find the specific layer digest that corresponds to that provenance attestation, both for linux/amd64 and linux/arm64 architectures, and sign it.
ci: Use github.repository_owner instead of hardcoded org. This allows to test the CI workflows in a fork, and to not need push permissions to production OCI registry namespace under ghcr.io/kyverno.
As an example of a GHA run, from my fork:
https://github.com/viccuad/policy-reporter/actions/runs/11270355378/job/31340877023
Resulting ghcr package:
https://github.com/users/viccuad/packages/container/package/policy-reporter
Looking forward to the review! Please tell me if a different approach is desired, I can open a different PR if so. Still, felt it was easier to have the conversation with an approach already.