Create Dockerfile with pyenv

Dockerfile

+# Image for Duniter releases on Linux.
+#
+# Building this image:
+#   docker build . -t duniter/release-builder
+
+FROM ubuntu:14.04
+
+ENV DEBIAN_FRONTEND noninteractive
+
+# Install needed tools
+RUN apt-get update && \
+	apt-get install -y apt-transport-https curl && \ 
+	apt-get update && \
+	apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# Create compiling user
+RUN mkdir /builder && \
+	adduser --system --group --quiet --shell /bin/bash --home /builder builder && \
+	chown builder:builder /builder
+WORKDIR /builder
+
+# Load pyenv
+ENV PYENV_ROOT "/builder/.pyenv"
+USER builder
+RUN git clone https://github.com/pyenv/pyenv.git /builder/.pyenv && \
+    echo "export PYENV_ROOT=$PYENV_ROOT" >> /builder/.profile && \
+    echo "export PATH=$PYENV_ROOT/bin:$PATH" >> /builder/.profile && \
+
+USER root
+
+# Entry point
+COPY bootstrap.sh /root/bootstrap.sh
+RUN chmod u+x /root/bootstrap.sh
+ENTRYPOINT ["/root/bootstrap.sh"]