RAS-1976: Fix cross-building Docker images - #67
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The final stage was pinned to --platform=$BUILDPLATFORM and go build never set GOARCH, so every pass built for amd64 and BuildKit labelled it arm64. Add ARG TARGETARCH + GOOS/GOARCH, unpin the final stage. Also swap the runtime image to alpine:3.24 (~250MB -> ~10MB), adding the ca-certificates and CGO_ENABLED=0 that golang:*-alpine gave us implicitly.
warrenbaileyons
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Sep 28, 2026
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This just needs the chart version updating
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/gcbrun |
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arroyoAle
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Oct 1, 2026
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What and why?
On our amd64 CI builder,
go buildused the builder's architecture, so the arm64-targeted image contained an amd64 binary and failed with an "exec format error". An Apple Silicon builder could mask the issue for arm64 builds. AddTARGETOS/TARGETARCHand setGOOS/GOARCH, and unpin the final stage so the image and binary target the requested platform.This cross-compiles the Go build stage without emulating the Go compiler.
RUNcommands in the final target-platform stage may still require emulation on a non-native builder.Switch the runtime stage from the Go image to
alpine:3.24, installca-certificates, and build withCGO_ENABLED=0to keep the runtime image small and the binary static.How to test?
Check the binary's ELF architecture in the built root filesystem. The binary is at
opt/print-file/print-file. The arm64 check should printb7 00; repeat withlinux/amd64, which should print3e 00.Jira
https://officefornationalstatistics.atlassian.net/browse/RAS-1976