Pin peribolos image by digest, tracked by Dependabot#16
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banesullivan
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akaszynski
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May 23, 2026
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scripts/run-peribolos.shpulledus-docker.pkg.dev/k8s-infra-prow/images/peribolos:latest. The tag is mutable: runs are not reproducible, and a compromised upstream image would execute in CI with the org-admin installation token mounted at/etc/github/token.Pin the image to a digest and route updates through the repo's existing Dependabot hookup so the digest does not drift silently:
docker/peribolos/Dockerfileholds the pinnedFROMline. The Dockerfile is never built; it exists as a single source of truth that Dependabot can watch..github/dependabot.ymlgains adockerecosystem entry pointed at that directory. Dependabot opens a PR when a new digest is available, on the same monthly cadence as the existinggithub-actionsupdates.scripts/run-peribolos.shparses theFROMline so the digest lives in exactly one place.Initial pin:
Digest taken from the image pulled on run 26330237447.
Also enabled Dependabot security updates on the repo (settings toggle, no diff in this PR).