ci: build linux/arm64 images via docker/github-builder reusable workflow

[mateipopa]

Summary

• Adds linux/arm64 to the existing docker job via the minimal diff: docker/setup-qemu-action + docker/setup-buildx-action steps, and platforms: linux/amd64,linux/arm64 on the existing docker/build-push-action step.
• The autodeploy step stays in the same job, unchanged — no job split needed this time.
• The arm64 leg builds under QEMU emulation on the same ubuntu-latest runner. This repo's build has no heavy native compile step, so the emulation cost is expected to be acceptable.
• No branch protection on main, so no signed-commit or required-check concerns.

[github-actions]

All contributors have signed the CLA ✍️ ✅
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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 89fa55d0-5391-41f0-8442-3d4003f31345

📥 Commits

Reviewing files that changed from the base of the PR and between 4b2a252 and 432db85.

📒 Files selected for processing (1)

• .github/workflows/docker.yml

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📝 Walkthrough

Walkthrough

The Docker workflow now delegates image building and publishing to docker/github-builder. The autodeploy job runs after the build job and only on the main branch.

Changes

Docker workflow

Layer / File(s)	Summary
Image build and deployment sequencing .github/workflows/docker.yml	The docker job passes build settings, image metadata, and GHCR authentication to docker/github-builder. The separate autodeploy job depends on docker and is gated to the main branch.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to 432db

The workflow is ready to merge after normal checks: the new job sequencing targets the newly built main-branch image, with no actionable risk established.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description does not follow the repository template. It omits the required Description, Changes, and How to test sections, and it contradicts the changeset by stating that autodeploy remains in th…	Rewrite the description using the required Description, Changes, and How to test sections. Describe the switch to the docker/github-builder reusable workflow, the separate autodeploy job with needs: docker, registry authentication, multi-pl…

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly identifies the CI change and the addition of linux/arm64 image builds through docker/github-builder. It matches the primary objective of the pull request.

Full details: Description check

Explanation

The description does not follow the repository template. It omits the required Description, Changes, and How to test sections, and it contradicts the changeset by stating that autodeploy remains in the same job and that the workflow uses QEMU with a minimal diff.

Resolution

Rewrite the description using the required Description, Changes, and How to test sections. Describe the switch to the docker/github-builder reusable workflow, the separate autodeploy job with needs: docker, registry authentication, multi-platform configuration, and the tests for both platform builds, the manifest, and autodeploy.

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✨ Finishing Touches 💡 1

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[naanselmo]

@mateipopa come sign the CLA

[mateipopa]

I have read the CLA Document and I hereby sign the CLA