use buildx to build multi arch images

.github/workflows/docker-images.yml

@@ -0,0 +1,32 @@
+name: Build docker images
+
+on:
+  push:
+    branches:
+      - master
+      - next
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout code
+        uses: actions/checkout@v2
+
+      # https://github.com/docker/setup-qemu-action
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      # https://github.com/docker/setup-buildx-action
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+
+      - name: login to docker hub
+        run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
+
+      - name: build the image
+        run: |
+          docker buildx build --push \
+          --tag edenhaus/bumper:latest \
+          --platform linux/amd64,linux/arm/v7,linux/arm64 .

Dockerfile

@@ -1,26 +1,6 @@
-ARG FROM_ARCH=amd64
+ARG ARCH=amd64
 
-FROM alpine as builder
-
-# Download QEMU, see https://github.com/ckulka/docker-multi-arch-example
-ADD https://github.com/balena-io/qemu/releases/download/v3.0.0%2Bresin/qemu-3.0.0+resin-arm.tar.gz .
-RUN tar zxvf qemu-3.0.0+resin-arm.tar.gz --strip-components 1
-ADD https://github.com/balena-io/qemu/releases/download/v3.0.0%2Bresin/qemu-3.0.0+resin-aarch64.tar.gz .
-RUN tar zxvf qemu-3.0.0+resin-aarch64.tar.gz --strip-components 1
-
-FROM $FROM_ARCH/python:3.7-alpine as base
-
-# Add QEMU
-# Add QEMU
-COPY --from=builder qemu-arm-static /usr/bin
-COPY --from=builder qemu-aarch64-static /usr/bin
-
-FROM base as builderfinal
-
-# add build utils (gcc, others)
-RUN apk add build-base
-
-FROM base
+FROM $ARCH/python:3.8-alpine
 
 COPY requirements.txt /requirements.txt
 

hooks/build

@@ -1,10 +0,0 @@
-#!/bin/bash
-
-# Custom build script to build images for all supported architectures.
-# Example for IMAGE_NAME: ckulka/baikal:apache
-
-for arch in amd64 arm32v7 arm64v8
-do
-  echo "Building $IMAGE_NAME-$arch"
-  docker build --build-arg FROM_ARCH=$arch --file $DOCKERFILE_PATH --tag $IMAGE_NAME-$arch .
-done

hooks/post_push

@@ -1,34 +0,0 @@
-#!/bin/bash
-
-# Use manifest-tool to create the manifest, given the experimental
-# "docker manifest" command isn't available yet on Docker Hub.
-curl -Lo manifest-tool https://github.com/estesp/manifest-tool/releases/download/v0.9.0/manifest-tool-linux-amd64
-chmod +x manifest-tool
-
-# Generate the manifest file.
-# Parameter 1 is the multi-arch image name, e.g. ckulka/baikal:0.5.1
-# Parameter 2 is the base-image for the variants, e.g. ckulka/baikal:0.5.1-apache
-function generate_manifest {
-  cat > manifest-generated.yaml << EOF
-image: $1
-manifests:
-  - image: $2-amd64
-    platform:
-      architecture: amd64
-      os: linux
-  - image: $2-arm32v7
-    platform:
-      architecture: arm
-      os: linux
-      variant: v7
-  - image: $2-arm64v8
-    platform:
-      architecture: arm64
-      os: linux
-      variant: v8
-EOF
-}
-
-echo "Pushing multi-arch manifest $IMAGE_NAME"
-generate_manifest $IMAGE_NAME $IMAGE_NAME
-./manifest-tool push from-spec manifest-generated.yaml

hooks/pre_build

@@ -1,5 +0,0 @@
-#!/bin/bash
-
-# Register qemu-*-static for all supported processors except the 
-# current one, but also remove all registered binfmt_misc before
-docker run --rm --privileged multiarch/qemu-user-static:register --reset

hooks/push

@@ -1,9 +0,0 @@
-#!/bin/bash
-
-# Custom build script to push images for all supported architectures.
-
-for arch in amd64 arm32v7 arm64v8
-do
-  echo "Pushing $IMAGE_NAME-$arch"
-  docker push $IMAGE_NAME-$arch
-done