[docker] add CI image and put images in paparazziuav organization

Automated builds on https://hub.docker.com/u/paparazziuav

docker/ci/Dockerfile

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+FROM paparazziuav/pprz-dep
+LABEL maintainer="felix.ruess@gmail.com"
+
+RUN sudo sh -c 'echo "deb http://packages.osrfoundation.org/gazebo/ubuntu-stable `lsb_release -cs` main" > /etc/apt/sources.list.d/gazebo-stable.list'
+RUN wget http://packages.osrfoundation.org/gazebo.key -O - | sudo apt-key add -
+
+RUN DEBIAN_FRONTEND=noninteractive apt-get update && apt-get install -y \
+    libgazebo7-dev \
+    && rm -rf /var/lib/apt/lists/*

docker/ci/README.md

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+# pprz-ci
+This is the CI image of the Paparazzi-UAV project.
+
+It adds gazebo.
+
+[Paparazzi-UAV](https://paparazziuav.org) is a free and open-source hardware and software project encompassing an exceptionally powerful and versatile autopilot system for fixedwing aircrafts as well as multicopters.