move build-multi-arch-image.sh to scripts/

Signed-off-by: Niels de Vos <ndevos@redhat.com>
(cherry picked from commit 5a4517e38e)

scripts/build-multi-arch-image.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+set -xe
+# "docker manifest" requires experimental feature enabled
+export DOCKER_CLI_EXPERIMENTAL=enabled
+
+cd "$(dirname "${0}")/.."
+
+# ceph base image used for building multi architecture images
+dockerfile="deploy/cephcsi/image/Dockerfile"
+baseimg=$(awk -F = '/^ARG BASE_IMAGE=/ {print $NF}' "${dockerfile}")
+
+# get image digest per architecture
+# {
+#   "arch": "amd64",
+#   "digest": "sha256:XXX"
+# }
+# {
+#   "arch": "arm64",
+#   "digest": "sha256:YYY"
+# }
+manifests=$(docker manifest inspect "${baseimg}" | jq '.manifests[] | {arch: .platform.architecture, digest: .digest}')
+# qemu-user-static is to enable an execution of different multi-architecture containers by QEMU
+# more info at https://github.com/multiarch/qemu-user-static
+docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+# build and push per arch images
+for ARCH in amd64 arm64; do
+	ifs=$IFS
+	IFS=
+	digest=$(awk -v ARCH=${ARCH} '{if (archfound) {print $NF; exit 0}}; {archfound=($0 ~ "arch.*"ARCH)}' <<<"${manifests}")
+	IFS=$ifs
+	base_img=${baseimg}@${digest}
+	GOARCH=${ARCH} BASE_IMAGE=${base_img} make image-cephcsi
+done