add an healthcheck route

app.mjs

@@ -190,8 +190,9 @@ async function initApp(app) {
     await app.start(process.env.PORT || port);
     console.log(`⚡️ Slack Bolt app is running on port ${port}!`);
     console.log(`Healthcheck endpoint available at http://localhost:${port}/healthcheck`);
-
+    // todo: confirm the block below is not preventing the bot to accept event in Cloudrun without no cpu throttling
     console.log(`Checking all expired duration based accesses are revoked.`)
     await startUpCleanUp(app)
     console.log(`All expired duration based accesses are revoked.`)
+
 })();