fix Dockerfile: system_config.ini formatting

Dockerfile

@@ -5,26 +5,26 @@ RUN addgroup -S motis && adduser -S motis -G motis && \
     mkdir /data && \
     chown motis:motis /data && \
     echo -e "\
-server.static_path=/motis/web \
-\
-intermodal.router=tripbased \
-\
-[import] \
-paths=schedule:/input/schedule \
-paths=osm:/input/osm.pbf \
-data_dir=/data \
-\
-[tiles] \
-profile=/motis/tiles-profiles/background.lua \
-\
-[osrm] \
-profiles=/motis/osrm-profiles/car.lua \
-profiles=/motis/osrm-profiles/bike.lua \
-profiles=/motis/osrm-profiles/bus.lua \
-\
-[ppr] \
-profile=/motis/ppr-profiles/default.json \
-" > /system_config.ini
+server.static_path=/motis/web\n\
+\n\
+intermodal.router=tripbased\n\
+\n\
+[import]\n\
+paths=schedule:/input/schedule\n\
+paths=osm:/input/osm.pbf\n\
+data_dir=/data\n\
+\n\
+[tiles]\n\
+profile=/motis/tiles-profiles/background.lua\n\
+\n\
+[osrm]\n\
+profiles=/motis/osrm-profiles/car.lua\n\
+profiles=/motis/osrm-profiles/bike.lua\n\
+profiles=/motis/osrm-profiles/bus.lua\n\
+\n\
+[ppr]\n\
+profile=/motis/ppr-profiles/default.json\n\
+\n" > /system_config.ini
 EXPOSE 8080
 VOLUME ["/data"]
 VOLUME ["/input"]