Add city gameplay, snapshot migrations, administration and Compose operations

Dockerfile

@@ -17,9 +17,13 @@ COPY --from=client /app/node_modules node_modules
 COPY --from=client /app/dist dist
 COPY --from=client /app/src src
 COPY --from=client /app/tools tools
+COPY --from=client /app/samples samples
 COPY --from=client /app/package.json package.json
 COPY --from=server /app/server/target/release/citygen-server /usr/local/bin/citygen-server
+RUN mkdir -p /app/public/cities /app/data && chown -R node:node /app
 ENV CITYGEN_BIND=0.0.0.0:3000
+USER node
+HEALTHCHECK --interval=15s --timeout=3s --start-period=30s --retries=3 CMD node -e "fetch('http://127.0.0.1:3000/health').then(r=>process.exit(r.ok?0:1)).catch(()=>process.exit(1))"
 VOLUME ["/app/public/cities", "/app/data"]
 EXPOSE 3000
 CMD ["citygen-server"]