feat(publish-image-index-manifest): Expose image index manifest digest#113
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dervoeti
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This is needed to generate SLSA provenance for our images (= signed attestations attached to an image / index manifest that prove when and how the image was built).
Add an
image-index-manifest-digestoutput to the publish-image-index-manifest action so the digest of the pushed multi-arch index can be fed into SLSA provenance generation.The digest is now computed right after
docker manifest pushin the create-index step and reused by the sign step instead of being recomputed.Optional extra information:
I added SLSA provenance to our fork of SecObserve already in a similar fashion, here is the workflow run:
https://github.com/stackabletech/SecObserve/actions/runs/28184881580
Here is an example of how to manually inspect the SLSA provenance attestation for an image:
Or using slsa-verifier:
It's basically a signed JSON document that provides a ton of metadata about the image build. The attestation is done by an isolated job that runs
https://github.com/slsa-framework/slsa-github-generator/blob/main/.github/workflows/generator_container_slsa3.yml, so it's an independent "witness" that can't be manipulated (this means we achieve SLSA level 3). Luckily it's pretty easy to do since we use GitHub actions.