Publish multi-arch (amd64 + arm64) container images#12
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Pin the builder stage to $BUILDPLATFORM so Go cross-compiles natively via GOARCH=$TARGETARCH instead of falling back to QEMU emulation, wire VERSION/GIT_COMMIT/BUILD_DATE build args into the existing pkg/version ldflags, and bump publish-docker.yaml to v1.13.1 with platforms: linux/amd64,linux/arm64. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
linux/amd64andlinux/arm64, so Apple Silicon (M1/M2/M3) developers and arm64 Kubernetes nodes can pull and runemail-provider-loopswithout emulation.pkg/versionldflags.Test plan
publish-container-imagejob succeeds and produces a multi-arch manifestdocker manifest inspect ghcr.io/datum-cloud/email-provider-loops:<tag>lists bothlinux/amd64andlinux/arm64docker run --platform linux/arm64 ghcr.io/datum-cloud/email-provider-loops:<tag> versionprints expected version info on Apple Silicondocker run --platform linux/amd64 ghcr.io/datum-cloud/email-provider-loops:<tag> versionworks on amd64Generated with Claude Code