Add Dockerfile used to generate the build image

CI/Dockerfile

+FROM ubuntu:18.04
+MAINTAINER Sebastien Dinot <sebastien.dinot@c-s.fr>
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN echo "Europe/Paris" > /etc/timezone
+
+# ----------------------------------------------------------------------------
+# First stage : install tools (they rarely evolve)
+# ----------------------------------------------------------------------------
+RUN apt-get update -y \
+ && apt-get upgrade -y \
+ && apt-get install -y --no-install-recommends \
+        ca-certificates \
+        curl \
+        make \
+        cmake \
+        g++ \
+        gcc \
+        git \
+        libtool \
+        swig \
+        xvfb \
+ && rm -rf /var/lib/apt/lists/*
+
+# ----------------------------------------------------------------------------
+# Second stage : dependencies (they evolve more often)
+# ----------------------------------------------------------------------------
+RUN apt-get update -y \
+ && apt-get upgrade -y \
+ && apt-get install -y --no-install-recommends \
+        freeglut3-dev \
+        libboost-date-time-dev \
+        libboost-filesystem-dev \
+        libboost-graph-dev \
+        libboost-program-options-dev \
+        libboost-system-dev \
+        libboost-thread-dev \
+        libcurl4-gnutls-dev \
+        libexpat1-dev \
+        libfftw3-dev \
+        libgdal-dev \
+        libgeotiff-dev \
+        libglew-dev \
+        libglfw3-dev \
+        libinsighttoolkit4-dev \
+        libkml-dev \
+        libmuparser-dev \
+        libmuparserx-dev \
+        libopencv-core-dev \
+        libopencv-ml-dev \
+        libopenmpi-dev \
+        libopenthreads-dev \
+        libossim-dev \
+        libpng-dev \
+        libqt5opengl5-dev \
+        libqwt-qt5-dev \
+        libshark-dev \
+        libsvm-dev \
+        libtinyxml-dev \
+        qtbase5-dev \
+        qttools5-dev \
+        python-dev \
+        python-numpy \
+        python-gdal \
+        python3-dev \
+        python3-numpy \
+        python3-gdal \
+ && rm -rf /var/lib/apt/lists/*