Create the Dockerfile for build npm

Dockerfile

+FROM library/ubuntu:17.10
+MAINTAINER Florian Thöni <florian.thoni@floth.fr>
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get update; \
+   apt-get install -y build-essentials \
+   apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+RUN curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.6/install.sh | bash
+RUN source "~/.nvm/nvm.sh"
+RUN nvm install 6
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