Update docker

docker/city4cfd-build-base.dockerfile

@@ -7,11 +7,26 @@ LABEL org.opencontainers.image.description="Base image for building City4CFD"
 LABEL org.opencontainers.image.licenses="AGPL-3.0"
 LABEL org.opencontainers.image.url="https://github.com/tudelft3d/city4cfd"
 
+# Install required packages and clean up
 RUN apt-get update && apt-get install -y --no-install-recommends \
     build-essential    \
     cmake              \
     libboost-all-dev   \
-    libcgal-dev        \
+    libgmp-dev         \
+    libmpfr-dev        \
     libeigen3-dev      \
     libomp-dev         \
-    libgdal-dev
+    libgdal-dev        \
+    wget               \
+    ca-certificates    \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/* \
+    && rm -rf /tmp/*
+
+# Download and extract CGAL
+RUN wget https://github.com/CGAL/cgal/releases/download/v6.0/CGAL-6.0-library.tar.xz \
+    && tar -xf CGAL-6.0-library.tar.xz -C /opt \
+    && rm CGAL-6.0-library.tar.xz
+
+# Set environment variable for CGAL
+ENV CGAL_DIR=/opt/CGAL-6.0