Add healthcheck

Dockerfile

@@ -16,5 +16,7 @@ COPY . .
 # Expose the port on which the Node.js application will run
 EXPOSE 3000
 
+HEALTHCHECK --start-period=5s --interval=1m --timeout=5s --retries=3  CMD node healthcheck.js || exit 1
+
 # Command to run the Node.js application
 CMD ["node", "index.js"]

healthcheck.js

@@ -0,0 +1,5 @@
+require('dotenv').config();
+
+fetch('http://localhost:3000/healthcheck').
+    then(res => process.exit(res.ok ? 0:1)).
+    catch(() => process.exit(1));

index.js

@@ -41,7 +41,7 @@ app.get('/', async (req, res) => {
     const result = await main();
 
     // Return 204 on true, otherwise throw 500 error
-    result ? res.status(204).end() : (() => {
+    result ? res.sendStatus(200) : (() => {
       throw new Error('Main function did not return true');
     })();
   } catch (error) {
@@ -50,6 +50,10 @@ app.get('/', async (req, res) => {
   }
 })
 
+app.get('/healthcheck', (req, res) => {
+  res.sendStatus(204);
+})
+
 // Start the Express server
 const PORT = process.env.PORT || 3000;
 app.listen(PORT, () => {