This docker image comes with Helm3 and kubectl installed. You can specify the desired version of Helm by setting the HELM_VERSION var. It defaults to 3.0.0-beta.3
docker run --rm -it thorstenhans/helm3
docker run --rm -it --entrypoint "" thorstenhans/helm3 helm version
docker run --rm -it --entrypoint "" thorstenhans/helm3 kubectl version