Adapt dockerfile

Dockerfile

-FROM ubuntu:latest
-ARG DEBIAN_FRONTEND=noninteractive
+FROM nestsim/nest:3.0
 RUN apt-get update && apt-get install -y \
-    cmake g++ make ninja-build python3 python3-dev python3-pip python3-numpy python3-scipy python3-matplotlib \
-    git gsl-bin libgsl0-dev libltdl-dev libtool netcat \
+    cmake g++ make ninja-build netcat git \
     libboost-atomic-dev libboost-thread-dev libboost-system-dev libboost-date-time-dev libboost-regex-dev \
     libboost-filesystem-dev libboost-random-dev libboost-chrono-dev libboost-serialization-dev \
-    libwebsocketpp-dev openssl libssl-dev ninja-build
-RUN pip3 install Cython
-RUN git clone --single-branch --branch nest-3 https://github.com/nest/nest-simulator.git nest && \
-    cd nest && \
-    git checkout 5c0f41230dda9e4b99b8df89729ea43b340246ad && \
-    cd /
-WORKDIR /nest-build
-RUN cmake \
-    -G Ninja \
-    -DCMAKE_INSTALL_PREFIX=/nest-install \
-    -DCMAKE_BUILD_TYPE=Release \
-    /nest
-RUN ninja && ninja install
+    libwebsocketpp-dev openssl libssl-dev
 RUN git clone --single-branch --branch v2.10.14 --recurse-submodules https://github.com/microsoft/cpprestsdk.git /cpprestsdk
 WORKDIR /cpprestsdk-build
 RUN cmake \
@@ -30,7 +16,7 @@ COPY . /insite
 WORKDIR /insite-build
 RUN cmake \
     -G Ninja \
-    -Dwith-nest=/nest-install/bin/nest-config \
+    -Dwith-nest=/opt/nest/bin/nest-config \
     -DCMAKE_BUILD_TYPE=Release \
     /insite
 RUN ninja && ninja install