Create a Docker container with both kubectl and helm

Dockerfile

# Based on https://github.com/wernight/docker-kubectl
# Both kubectl and helm are available when we launch the image (docker run -ti this-image).
# The best option would be mounting the ".kube/config" file as a volume.
FROM wernight/kubectl:1.5.3

# Install Helm
USER root
RUN cd /home \
	&& curl https://storage.googleapis.com/kubernetes-helm/helm-v2.2.3-linux-amd64.tar.gz -o helm.tar.gz \
	&& tar -xvf helm.tar.gz \
	&& rm helm.tar.gz \
	&& mv linux-amd64/helm /usr/local/bin/helm \
	&& chmod +x /usr/local/bin/helm \
	&& helm --help \
	&& cd

ENTRYPOINT /bin/sh