Move build to a single file

.drone.yml

@@ -30,11 +30,6 @@ trigger:
     - refs/tags/v*
 
 steps:
-  - name: get qemu
-    image: busybox
-    commands:
-      - sh ./get_qemu.sh x86_64
-
   - name: build
     image: plugins/docker
     settings:
@@ -62,11 +57,6 @@ trigger:
     - refs/tags/v*
 
 steps:
-  - name: get qemu
-    image: busybox
-    commands:
-      - sh ./get_qemu.sh arm
-
   - name: build
     image: plugins/docker
     settings:
@@ -97,11 +87,6 @@ trigger:
     - refs/tags/v*
 
 steps:
-  - name: get qemu
-    image: busybox
-    commands:
-      - sh ./get_qemu.sh aarch64
-
   - name: build
     image: plugins/docker
     settings:

Dockerfile

@@ -2,11 +2,13 @@
 # The following will work with any library image that supports multi-arch
 # Other repositories may use tag suffix instead
 ARG REPO=library
+FROM multiarch/qemu-user-static:4.2.0-2 as qemu-user-static
+
 FROM ${REPO}/python:3-alpine
 
 # This should be the target qemu arch
 ARG ARCH=x86_64
-COPY ./build/qemu-${ARCH}-static /usr/bin/
+COPY --from=qemu-user-static /usr/bin/qemu-* /usr/bin/
 
 # Everything below here is just a simple example
 

Makefile

@@ -7,28 +7,18 @@ default: test
 test:
 	@echo ok
 
-# Targets to download required qemu binaries for running on an amd64 machine
-build/qemu-x86_64-static:
-	./get_qemu.sh x86_64
-
-build/qemu-arm-static:
-	./get_qemu.sh arm
-
-build/qemu-aarch64-static:
-	./get_qemu.sh aarch64
-
 # Build Docker image for host architechture (amd64)
 .PHONY: build
-build: build/qemu-x86_64-static
+build:
 	docker build . -t ${DOCKER_TAG}-linux-amd64
 
 # Cross build for arm architechtures
 .PHONY: cross-build-arm
-cross-build-arm: build/qemu-arm-static
+cross-build-arm:
 	docker build --build-arg REPO=arm32v6 --build-arg ARCH=arm . -t ${DOCKER_TAG}-linux-arm
 
 .PHONY: cross-build-arm
-cross-build-arm64: build/qemu-aarch64-static
+cross-build-arm64:
 	docker build --build-arg REPO=arm64v8 --build-arg ARCH=aarch64 . -t ${DOCKER_TAG}-linux-arm64
 
 # Run on host architechture