Dockerfile to cross-compile Go binaries for a target platform and produce a Docker image for the target platform

Dockerfile

# Dockerfile to cross-compile Go binaries for a target platform
#
# Usage:
#     $ docker build --platform linux/arm .

# Cross-compile package for target platform from build platform
FROM --platform=${BUILDPLATFORM} golang:1-alpine AS build

ADD . /tmp/go
WORKDIR /tmp/go

ARG PACKAGES=.
# TARGETOS and TARGETARCH are set by buildkit
ARG TARGETOS
ARG TARGETARCH

ENV CGO_ENABLED 0
ENV GOOS ${TARGETOS}
ENV GOARCH ${TARGETARCH}

RUN \
  for pkg in `go list ${PACKAGES:-.}`; do \
    go build -v -o /var/go/bin/`basename $pkg` $pkg; \
  done


# Build executable image for target platform
# TARGETPLATFORM is set by buildkit
ARG TARGETPLATFORM
FROM --platform=${TARGETPLATFORM} alpine:3.8

# Copy binaries from build container
COPY --from=build /var/go/bin/* /usr/local/bin/