feat: implement simple healthcheck endpoint

apps/server/src/app.ts

@@ -84,6 +84,11 @@ app.use(bodyParser);
 app.use(cookieParser());
 const { authenticate, authenticateAndRedirect } = makeAuthenticateMiddleware(prefix);
 
+// implement health check route
+app.get(`${prefix}/health`, (_req, res) => {
+  res.status(200).send('OK');
+});
+
 // Implement route endpoints
 app.use(`${prefix}/login`, loginRouter); // router for login flow
 app.use(`${prefix}/data`, authenticate, appRouter); // router for application data