First version, accesses secure server

Dockerfile

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+# Secure temp download stage
+FROM ubuntu:18.04 as intermediate
+ENV DEBIAN_FRONTEND=noninteractive TZ=Europe/Berlin
+
+# Setup git
+RUN apt-get update && \
+    apt-get -y install git && \
+    rm -rf /var/lib/apt/lists/*
+
+# Setup key and server for proprietary code
+ARG PROP_SERVER
+ARG PROP_SERVER_USER
+ARG PROP_SERVER_KEY
+RUN mkdir /root/.ssh/ && chmod 700 /root/.ssh && \
+    echo "${PROP_SERVER_KEY}" > /root/.ssh/id_rsa && chmod 600 /root/.ssh/id_rsa && \
+    echo "Host ${PROP_SERVER}" > /root/.ssh/config && echo "  User ${PROP_SERVER_USER}" >> /root/.ssh/config && \
+    echo "  IdentityFile ~/.ssh/id_rsa" >> /root/.ssh/config && chmod 644 /root/.ssh/config && \
+    touch /root/.ssh/known_hosts && chmod 644 /root/.ssh/known_hosts && \
+    ssh-keyscan -H ${PROP_SERVER} >> /root/.ssh/known_hosts
+
+# Clone sources
+ARG PROP_DIR_SDR
+ARG PROP_DIR_DECODER
+WORKDIR /app
+RUN git clone https://github.com/MOVE-II/move2radio.git && \
+    git clone git@${PROP_SERVER}:${PROP_DIR_SDR}/ldpc.git move2radio-prop/ldpc && \
+    git clone git@${PROP_SERVER}:${PROP_DIR_SDR}/gr-ccsds.git move2radio-prop/gr-ccsds
+
+# Build stage
+FROM ubuntu:18.04
+ENV DEBIAN_FRONTEND=noninteractive TZ=Europe/Berlin
+
+# Setup build deps
+RUN apt-get update && \
+    apt-get -y install build-essential git cmake python2.7 python-pip wget autoconf unzip libtool-bin pkgconf && \
+    rm -rf /var/lib/apt/lists/*
+
+# Copy sources from download stage
+COPY --from=intermediate /app /app
+
+# Build sources
+WORKDIR /app/move2radio
+RUN mkdir build && cd build && \
+    cmake -DAPPIMAGE=OFF -DLDPC_OFFLINE=ON -DGR_CCSDS_OFFLINE=ON -DOFFLINE_DEPENDENCY_PATH=/app/move2radio-prop .. && \ 
+    make build_gr_ccsds
+
+ENTRYPOINT ["/bin/bash"]