Added Dockerfile for VPB terrain generator

Added a Dockerfile that can be used to build a docker/podman image with
the required environment for VPB terrain generator. A sample generation
script is also included.

ws30/ws30-vbp-generator-docker/Dockerfile

@@ -0,0 +1,44 @@
+FROM ubuntu:focal
+
+WORKDIR /home/flightgear/build/
+
+# Set timezone:
+RUN ln -snf /usr/share/zoneinfo/$CONTAINER_TIMEZONE /etc/localtime && echo $CONTAINER_TIMEZONE > /etc/timezone
+
+RUN apt-get update && \
+    apt-get install -y \
+      build-essential \
+      cmake \
+      git \
+      libnvtt-dev
+
+RUN git clone --branch release/2.4 https://github.com/OSGeo/gdal.git
+WORKDIR /home/flightgear/build/gdal/gdal
+RUN ./configure
+RUN make -j $(nproc)
+RUN make install
+
+WORKDIR /home/flightgear/build/
+RUN git clone --branch OpenSceneGraph-3.6.5 https://github.com/openscenegraph/OpenSceneGraph.git
+RUN mkdir OpenSceneGraph/build/
+RUN cat /etc/apt/sources.list
+RUN sed -i 's/# deb-src/deb-src/' /etc/apt/sources.list
+RUN cat /etc/apt/sources.list
+RUN apt-get update && apt-get build-dep -y openscenegraph
+WORKDIR OpenSceneGraph/build
+RUN cmake -D CMAKE_BUILD_TYPE="Release" -D CMAKE_CXX_FLAGS_RELEASE="-O3 -pipe" -D CMAKE_C_FLAGS_RELEASE="-O3 -pipe" -D CMAKE_INSTALL_RPATH_USE_LINK_PATH:BOOLEAN="true" -G "Unix Makefiles" ..
+RUN make -j $(nproc)
+RUN make install
+
+WORKDIR /home/flightgear/build/
+RUN git clone https://github.com/openscenegraph/VirtualPlanetBuilder.git && cd VirtualPlanetBuilder && git checkout VirtualPlanetBuilder-1.0
+RUN mkdir VirtualPlanetBuilder/build/
+WORKDIR /home/flightgear/build/VirtualPlanetBuilder/build/
+RUN cmake ..
+RUN make -j $(nproc)
+RUN make install
+
+WORKDIR /home/flightgear/
+ENV LD_LIBRARY_PATH /usr/local/lib64:/usr/local/lib
+
+CMD ["/bin/bash"]