Docker container works with new image and Python 3 now

Dockerfile

-FROM dorie/dune-env:2.5
+FROM dorie/dune-env:2.5.1
 MAINTAINER Dion Häfner
 
 WORKDIR /opt/dune
 ADD . /opt/dune/dorie/
-RUN source /opt/dune/venv/dorie/bin/activate && ./dune-common/bin/dunecontrol --only=dorie all
+RUN CMAKE_FLAGS="-DCMAKE_BUILD_TYPE=Release -DDUNE_PYTHON_VIRTUALENV_SETUP=True -DDUNE_PYTHON_ALLOW_GET_PIP=True" ./dune-common/bin/dunecontrol --only=dorie all
 ENV PATH="/opt/dune/dorie/build-cmake/bin:${PATH}"
 WORKDIR /sim
 ENTRYPOINT ["/opt/dune/dorie/build-cmake/bin/dorie"]
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