add code to generate member map

Dockerfile

@@ -0,0 +1,20 @@
+FROM ubuntu:22.04
+
+ARG PLZ_DATA=Postleitzahlengebiete_-_OSM.geojson
+ARG PLZ_HIGHLIGHT=wtf_member_plz_prefixes.json
+
+# Set up environment with dependencies
+RUN apt-get update && apt-get install libblas-dev python3-pip libgeos-dev wget -y
+COPY requirements.txt ./
+RUN pip install -r requirements.txt
+
+# Copy all relevant data
+COPY $PLZ_DATA ./
+COPY $PLZ_HIGHLIGHT ./
+
+# Render map
+COPY main.py ./
+RUN python3 main.py --plz-data $PLZ_DATA --plz-highlight $PLZ_HIGHLIGHT --out /tmp/map.png
+
+# Output map; use with "docker build -t wtf-map . && docker run wtf-map > map.png"
+CMD ["cat", "/tmp/map.png"]