feat(docker): Add multi-platform support for Docker build

[gondoi]

No description provided.

[cursor]

PR Summary

Low Risk
Low risk GitHub Actions change that only affects Docker build outputs; main risk is longer builds or platform-specific build failures when producing arm64 images.

Overview
Updates the composite GitHub Action ./.github/actions/docker-publish to publish multi-platform Docker images by building for linux/amd64 and linux/arm64 in the docker/build-push-action step.

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[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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[cursor]

Multi-platform builds produce empty imageid output

Low Severity

Adding platforms: linux/amd64,linux/arm64 causes docker/build-push-action to produce an empty imageid output, since multi-platform builds create a manifest list rather than a single image. The composite action still declares imageid as an output and displays it in the build summary, both of which will now always be empty strings. Any downstream consumer relying on this output will silently receive no value.

Additional Locations (2)

• .github/actions/docker-publish/action.yaml#L34-L37
• .github/actions/docker-publish/action.yaml#L99-L100

 

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[cursor]

Missing QEMU setup breaks arm64 platform build

High Severity

Adding platforms: linux/amd64,linux/arm64 requires QEMU emulation for arm64 on x86_64 GitHub Actions runners, but docker/setup-qemu-action is not present before docker/setup-buildx-action. The Dockerfile's final stage (FROM debian:bookworm-slim) runs apt-get under the target platform, which will fail for arm64 without QEMU's binfmt_misc handlers registered. The build stages avoid this by using --platform=$BUILDPLATFORM, but the runtime stage does not.

 

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