build(ci): publish multi-arch (amd64 + arm64) container image#568
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build(ci): publish multi-arch (amd64 + arm64) container image#568
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Adds linux/arm64 to the published ghcr.io/datum-cloud/milo image so Apple Silicon and arm64 CI runners can pull and run milo without ImagePullBackOff. The Dockerfile builder stage is pinned to $BUILDPLATFORM and now honors $TARGETOS/$TARGETARCH for native cross-compilation under buildx; the reusable publish-docker workflow already exposes a `platforms` input, so the workflow change is a single extra line.
Contributor
scotwells
requested review from
aflor024,
ecv,
kevwilliams,
privateip,
slindseysr and
zachsmith1
ecv
approved these changes
Apr 16, 2026
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Summary
ghcr.io/datum-cloud/milofor bothlinux/amd64andlinux/arm64so Apple Silicon developer machines and arm64 CI runners can pull the image without hittingImagePullBackOff: no matching manifest for linux/arm64/v8.--platform=$BUILDPLATFORMand parameterizesGOOS/GOARCHvia$TARGETOS/$TARGETARCH, enabling fast native cross-compilation under buildx (no QEMU emulation needed for the build step; the runtime stage isgcr.io/distroless/static, which is COPY-only).datum-cloud/resource-metricsagainst milo on Apple Silicon.Test plan
publish-container-imagejob succeeds withplatforms: linux/amd64,linux/arm64.docker manifest inspect ghcr.io/datum-cloud/milo:<next-tag>lists bothlinux/amd64andlinux/arm64entries.ghcr.io/datum-cloud/milo:<next-tag>on an arm64 host (Apple Silicon / arm64 Kubernetes node) succeeds and the container starts.Notes
datum-cloud/actions/.github/workflows/publish-docker.yaml@v1.8.1already accepts aplatformsinput and wires it intodocker/setup-buildx-actionanddocker/build-push-action, so no cross-repo change is required.docker buildx build --platform=linux/amd64,linux/arm64 -t milo:multiarch-test .completed successfully on Apple Silicon (without--load, since multi-platform images can't be loaded into the local Docker engine in one shot). The arm64 binary built natively; the amd64 binary was cross-compiled by Go on the arm64 builder. No QEMU was required.