Make Docker workdir /data

This is where the data ends up when you run the command in the
readme.

This feels very fragile though -- it really needs to scripts to
build this data.

Dockerfile

@@ -39,8 +39,6 @@ RUN unzip -o ./lookup-service.zip -d ./lookup && \
 
 RUN rm *.zip
 
-WORKDIR /app/lookup/lookup-service
-
 ENV JAVA_OPTS=-Xmx4g
 
-CMD java -jar lib/lookup-service-1.0-SNAPSHOT-onejar.jar server data/config/config.yml
+CMD java -jar /app/lookup/lookup-service/lib/lookup-service-1.0-SNAPSHOT-onejar.jar server lookup/lookup-service/data/config/config.yml