Bugfix/Update worker docker (#4643)

update worker docker

docker/worker/healthcheck/healthcheck.js

@@ -0,0 +1,13 @@
+const express = require('express')
+const app = express()
+
+const port = process.env.WORKER_PORT || 5566
+
+app.get('/healthz', (req, res) => {
+    res.status(200).send('OK')
+})
+
+app.listen(port, () => {
+    // eslint-disable-next-line no-console
+    console.log(`Healthcheck server listening on port ${port}`)
+})