[Docker] Add support for arm32/64 (#2104)

hooks/push

@@ -0,0 +1,9 @@
+#!/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