ci: build multi-arch Docker image (amd64 + arm64)#6
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Add QEMU emulation (docker/setup-qemu-action@v4) and set platforms: linux/amd64,linux/arm64 in the build-push step so the published Docker Hub image includes an arm64 manifest. This fixes 'no matching manifest for linux/arm64/v8' errors when pulling the image on Apple Silicon Macs.
agpituk
approved these changes
May 20, 2026
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Problem
Pulling
mzdotai/otari-sandbox-containeron Apple Silicon (arm64) Macs fails with:The CI pipeline only builds and pushes
linux/amd64images because thedocker/build-push-actionstep has noplatforms:key.Fix
Two changes to
.github/workflows/build-and-push.yml:docker/setup-qemu-action@v4(latest) — installs QEMU user-static binaries so buildx can cross-compile for arm64 on the amd64 GitHub runner.platforms: linux/amd64,linux/arm64to thedocker/build-push-actionstep — produces a multi-arch manifest with images for both architectures.No Dockerfile changes needed — the base image (
python:3.12-slim) and all installed packages already support arm64.Trade-offs