added devcontainer.

fix build error, deploy using docker-compose works,
misc changes
using global MQTT instead of local one to tap to already existin broker

Dockerfile

@@ -18,7 +18,9 @@ ENV NODE_ENV development-dockerfile
 # USING BASE_IMAGE
 FROM node:12-alpine
 COPY --from=BASE_IMAGE /app /
-CMD npm start
+# CMD npm start
+CMD ["npm", "run", "start:debug"]
+
 EXPOSE 2080
 # CMD [“dumb-init”, “node”, dht.js”]
 # CMD ["npm","run", "pm2"]