Add multiarch build hooks for Docker; see #65

.gitignore

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+# Autogenerated Dockerfiles
+/docker/Dockerfile.*

hooks/build

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+#!/bin/sh
+
+# Build main amd64 image
+docker build -f docker/Dockerfile.amd64 -t $IMAGE_NAME-amd64 -t $IMAGE_NAME .
+
+# Build multiarch images
+docker build -f docker/Dockerfile.arm32v7 -t $IMAGE_NAME-arm32v7 .
+docker build -f docker/Dockerfile.arm64v8 -t $IMAGE_NAME-arm64v8 .

hooks/post_checkout

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+#!/bin/sh
+
+# Generate architecture-specific Dockerfiles
+for arch in amd64 arm32v7 arm64v8; do
+    cat Dockerfile | sed -e "s/php:apache/${arch}\/php:apache/" > docker/Dockerfile.${arch}
+done

hooks/post_push

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+#!/bin/sh
+
+# Create manifest and annotate multiarch image
+docker manifest create $IMAGE_NAME $IMAGE_NAME-amd64 $IMAGE_NAME-arm32v7 $IMAGE_NAME-arm64v8
+docker manifest annotate $IMAGE_NAME $IMAGE_NAME-amd64 --os linux --arch amd64
+docker manifest annotate $IMAGE_NAME $IMAGE_NAME-arm32v7 --os linux --arch arm --variant v7
+docker manifest annotate $IMAGE_NAME $IMAGE_NAME-arm64v8 --os linux --arch arm64
+
+# Replace image in registry
+docker manifest push --purge $IMAGE_NAME

hooks/pre_build

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+#!/bin/sh
+
+# Set up QEMU for cross compilation
+docker run --rm --privileged multiarch/qemu-user-static --reset -p yes

hooks/pre_push

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+#!/bin/sh
+
+# Push multiarch images
+for arch in amd64 arm32v7 arm64v8; do
+    docker push $IMAGE_NAME-${arch}
+done