Dockerfile.aarch64/armhf update the crossbuild method

hooks/post_checkout

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+BUILD_ARCH=$(echo "${DOCKERFILE_PATH}" | cut -d '.' -f2)
+
+[ "${BUILD_ARCH}" == "Dockerfile" ] && \
+    { echo 'qemu-user-static: Download not required for this arch'; exit 0; }
+
+TAGS_API="https://api.github.com/repos/multiarch/qemu-user-static/tags"
+URL="https://github.com/multiarch/qemu-user-static/releases/download"
+LATEST_TAG=$(curl -LSs $TAGS_API \
+    | awk -F'"' '/name.*v[0-9]/ {print $4; exit}')
+STATIC_ARCH=$([ "${BUILD_ARCH}" == "armhf" ] && \
+    echo "${BUILD_ARCH::-2}" || echo "${BUILD_ARCH}")
+
+curl -LSs "${URL}/${LATEST_TAG}/x86_64_qemu-${STATIC_ARCH}-static.tar.gz" \
+    | tar xzv

hooks/pre_build

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+BUILD_ARCH=$(echo "${DOCKERFILE_PATH}" | cut -d '.' -f2)
+
+[ "${BUILD_ARCH}" == "Dockerfile" ] && \
+    { echo 'qemu-user-static: Registration not required for this arch';exit 0; }
+
+docker run --rm --privileged multiarch/qemu-user-static:register --reset