Initial

.dockerignore

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+README.md
+Makefile

.drone.yml

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+kind: pipeline
+name: amd64
+
+steps:
+  - name: build
+    image: docker
+    commands:
+      - make build
+
+---
+kind: pipeline
+name: arm
+
+steps:
+  - name: build
+    image: docker
+    commands:
+      - make cross-build-arm

.gitignore

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+qemu-*
+*.tar.gz

Dockerfile

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+ARG REPO=library
+FROM ${REPO}/python:3-alpine
+
+ARG ARCH=x86_64
+COPY ./build/qemu-${ARCH}-static /usr/bin/
+
+
+RUN echo "OK" > /foo
+
+
+CMD [ "cat", "/foo" ]

Makefile

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+DOCKER_TAG ?= multiarch-test-${USER}
+
+.PHONY: default
+default: test
+
+.PHONY:test
+test:
+	@echo ok
+
+.PHONY: build
+build: build/qemu-x86_64-static
+	docker build . -t ${DOCKER_TAG}
+
+build/qemu-arm-static:
+	./get_qemu.sh
+
+build/qemu-x86_64-static:
+	./get_qemu.sh
+
+build/qemu-aarch64-static:
+	./get_qemu.sh
+
+.PHONY: cross-build-arm
+cross-build-arm: build/qemu-arm-static
+	docker build --build-arg REPO=arm32v6 --build-arg ARCH=arm . -t ${DOCKER_TAG}-arm32v6
+
+.PHONY: run
+run: build
+	docker run ${DOCKER_TAG}
+
+.PHONY: run
+cross-run-arm: cross-build-arm
+	docker run --rm ${DOCKER_TAG}-arm32v6

get_qemu.sh

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+#! /bin/bash
+
+HOST_ARCH=x86_64
+VERSION=v2.9.1-1
+
+mkdir -p build
+cd build
+
+for target_arch in aarch64 arm x86_64; do
+  wget -N https://github.com/multiarch/qemu-user-static/releases/download/$VERSION/${HOST_ARCH}_qemu-${target_arch}-static.tar.gz
+  tar -xvf ${HOST_ARCH}_qemu-${target_arch}-static.tar.gz
+  rm ${HOST_ARCH}_qemu-${target_arch}-static.tar.gz
+done