feat(Dockerfile): add helm to the image

Author: mboersma

README.md

@@ -15,6 +15,7 @@ creating [issues][] and submitting [pull requests][].
 * [glide][]: go dependency management
 * [golint][]: go source code linter
 * [gox][]: simple go cross-compiling tool
+* [helm][]: Kubernetes package manager
 * [jq][]: command-line JSON processor
 * [kubectl][]: Kubernetes command-line client
 * [shellcheck][]: static analysis for shell scripts
@@ -55,6 +56,7 @@ The latest deis/go-dev Docker image is available at:
 [Go]: https://golang.org/
 [golint]: https://github.com/golang/lint
 [gox]: https://github.com/mitchellh/gox
+[helm]: https://github.com/kubernetes/helm
 [issues]: https://github.com/deis/docker-go-dev/issues
 [jq]: https://stedolan.github.io/jq/
 [kubectl]: https://kubernetes.io/docs/user-guide/kubectl-overview/

rootfs/Dockerfile

@@ -3,6 +3,7 @@ FROM quay.io/deis/base:v0.3.6
 ENV GO_VERSION=1.8.3 \
     GLIDE_VERSION=v0.12.3 \
     GLIDE_HOME=/root \
+    HELM_VERSION=v2.4.2 \
     KUBECTL_VERSION=v1.6.4 \
     SHELLCHECK_VERSION=v0.4.6 \
     PATH=$PATH:/usr/local/go/bin:/go/bin:/usr/local/bin/docker \
@@ -32,6 +33,8 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
   && rm /tmp/protoc.zip \
   && curl -sSL https://storage.googleapis.com/kubernetes-release/release/$KUBECTL_VERSION/bin/linux/amd64/kubectl -o /usr/local/bin/kubectl \
   && chmod +x /usr/local/bin/kubectl \
+  && curl -sSL https://storage.googleapis.com/kubernetes-helm/helm-$HELM_VERSION-linux-amd64.tar.gz \
+    | tar -vxz -C /usr/local/bin --strip=1 \
   && apt-get purge -y --auto-remove \
     unzip \
   && apt-get autoremove -y \