Add backport script

recipe-client-addon/bin/backport-from-mozilla-central.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+set -eu
+
+if [[ $# -lt 1 ]]; then
+  echo "usage: $(basename $0) MOZ-CENTRAL" >&2
+  exit 1
+fi
+
+baseDir="$(dirname "$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )")"
+mozCentral="$1"
+src="${mozCentral}/browser/extensions/shield-recipe-client"
+dest="${baseDir}/"
+
+while read -r line || [[ -n "${line}" ]]; do
+  mkdir -p "$(dirname "${dest}/${line}")"
+  cp -r "${src}/${line}" "$(dirname "${dest}/${line}")"
+done < "${baseDir}/build-includes.txt"