Add a /health endpoint and use it with docker's HEALTHCHECK

Author: chapa

Dockerfile

@@ -23,3 +23,5 @@ RUN \
 WORKDIR /app
 EXPOSE 3000
 CMD [ "npm", "run", "installandstartdev" ]
+
+HEALTHCHECK CMD curl -f http://localhost:3000/health || exit 1

src/server.js

@@ -22,6 +22,8 @@ app.use((req, res, next) => {
   next();
 });
 
+app.get("/health", (req, res) => res.sendStatus(200));
+
 const handler = (res, params) => {
   osmsm(params)
     .then(data => res.end(data))