Review summary: buildkite/agent PR #4299

Verdict

Approved with no inline findings.

Submitted review: #4299 (review)

Change reviewed

This Dependabot PR updates two digest-pinned CI/support images under .buildkite/:

• .buildkite/Dockerfile-lint moves golangci/golangci-lint from v2.12-alpine to v2.13-alpine and updates the pinned OCI index digest.
• .buildkite/Dockerfile-ruby keeps Ruby at 4.0.6 while refreshing the pinned OCI index digest for the rebuilt upstream image.

The lint image supplies golangci-lint to .buildkite/steps/check-code-committed.sh through the lint service in .buildkite/docker-compose.yml. The Ruby image supplies the ruby compose service used by scripts/ruby-env, which is called from the Debian and RPM package build steps.

Context and evidence examined

• Read the complete two-file diff against the v3 base branch and verified the checked-out commit matched PR head 3bbdcf214ecf3ee8179ca1b4609b85ff03a71a8b immediately before submission.
• Read the PR description, commit metadata, Dependabot configuration, both changed Dockerfiles, the compose service definitions, relevant Buildkite pipeline steps, lint script, Ruby wrapper, and package-build call sites.
• Checked the prior history of these Dockerfiles. Digest-only Ruby refreshes and grouped image updates follow the repository's existing Dependabot pattern.
• Queried Docker Hub's registry API for both new tag/digest pairs. Each pinned digest exactly matched the current tag:
  • golangci/golangci-lint:v2.13-alpine → sha256:da1f79b184ff1d98781648407d05a99b9cba7b282aa3416b0a0eac102a3b0557
  • ruby:4.0.6 → sha256:a5752fdd44a3dd5381e018daaa72735aa9fdf074625e9a6f9237137ddcefeb44
• Confirmed the lint image index includes Linux AMD64 and ARM64 variants, and the Ruby image retains broad Linux architecture coverage including AMD64 and ARM64.
• Confirmed the upstream golangci-lint v2.13.0 release exists and reviewed its published changelog.
• Ran git diff --check; it passed.
• Checked all PR reviews, inline threads, and conversation comments. There were no prior review concerns or approval-ceiling grants to account for, and no Linear issue was referenced in the branch name, PR title, or PR body.

CI and checks

At review time, GitHub reported the category-label and Socket checks passing. The main buildkite/agent build (#14158) was still pending, and the buildsworth review build was still in progress. A direct Buildkite CLI lookup could not verify build details because the available API credentials did not expose that organization.

I did not run Go tests because the PR changes no Go source or modules. Docker was not available in the review environment, so I did not locally build or execute the images; registry digest/platform validation and the surrounding call-site review were used instead.

Findings

No correctness, compatibility, security, or repository-pattern issue warranted an inline comment. Both image references remain immutably digest-pinned, the tag/digest pairs are valid, and the affected services retain the platform coverage their current call sites require. The Ruby change is an upstream rebuild at the same language version rather than a Ruby version upgrade.

Trigger source: automatic.