add docker cloud hooks for onbuild

hooks/README.md

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+# Docker Cloud build hooks
+
+These are the hooks

hooks/build

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+#!/bin/bash
+set -ex
+
+docker build -t $DOCKER_REPO:$DOCKER_TAG .
+# build onbuild
+docker build --build-arg BASE_IMAGE=$DOCKER_REPO:$DOCKER_TAG -t ${DOCKER_REPO}-onbuild:$DOCKER_TAG .
+
+for V in master $stable; do
+
+    docker build --build-arg JUPYTERHUB_VERSION=$V -t $DOCKER_REPO:$V .
+done
+
+echo "tagging $IMAGE_NAME"
+docker tag $DOCKER_REPO:$stable $IMAGE_NAME

hooks/post_push

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+stable=0.8
+export ONBUILD=${DOCKER_REPO}_onbuild
+# push ONBUILD image
+docker push $ONBUILD:$DOCKER_TAG
+
+function get_hub_version() {
+  rm -f hub_version
+  docker run --rm -v $PWD:/version -u $(id -u) -i $DOCKER_REPO:$DOCKER_TAG sh -c 'jupyterhub --version > /version/hub_version'
+  hub_xyz=$(cat hub_version)
+  split=( ${hub_xyz//./ } )
+  hub_xy="${split[0]}.${split[1]}"
+}
+
+
+get_hub_version
+# when building 0.9.0.dev, push 0.9.0 and 0.9 tags as well
+docker tag $DOCKER_REPO:$hub_xyz $DOCKER_REPO:$DOCKER_TAG
+docker push $DOCKER_REPO:$hub_xyz
+docker tag $ONBUILD:$hub_xyz $ONBUILD:$DOCKER_TAG
+docker push $ONBUILD:$hub_xyz
+
+docker tag $DOCKER_REPO:$hub_xy $DOCKER_REPO:$DOCKER_TAG
+docker push $DOCKER_REPO:$hub_xy
+docker tag $ONBUILD:$hub_xy $DOCKER_REPO:$DOCKER_TAG
+docker push $ONBUILD:$hub_xyz