add docker hub arm build capability

hooks/post_push

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# Use manifest-tool to create the manifest, given the experimental
+# "docker manifest" command isn't available yet on Docker Hub.
+
+curl -Lo manifest-tool https://github.com/estesp/manifest-tool/releases/download/v0.9.0/manifest-tool-linux-amd64
+chmod +x manifest-tool
+
+./manifest-tool push from-spec multi-arch-manifest.yaml

hooks/pre_build

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+# Register qemu-*-static for all supported processors except the 
+# current one, but also remove all registered binfmt_misc before
+docker run --rm --privileged multiarch/qemu-user-static:register --reset