optical changes

Dockerfile

@@ -22,6 +22,6 @@ RUN mkdir cache && chown node:node cache
 USER node
 EXPOSE 3000
 HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
-  CMD wget -qO- http://127.0.0.1:3000/healthz > /dev/null || exit 1
+  CMD wget -qO- "http://127.0.0.1:${PORT}/healthz" > /dev/null || exit 1
 
 CMD ["node", "src/server.js"]