test: fix flaky (#1953)

scripts/wait-3000-healthz.mjs

@@ -0,0 +1,37 @@
+import http from 'node:http';
+
+const options = {
+  hostname: 'localhost',
+  port: 3000,
+  path: '/api/healthz',
+  method: 'GET',
+};
+
+const maxAttempts = 5;
+const timeout = 1000;
+let attempts = 0;
+
+while (attempts < maxAttempts) {
+  await new Promise(resolve => setTimeout(resolve, timeout * (1 << attempts)));
+  await new Promise(resolve => {
+    const req = http.request(options, res => {
+      if (res.statusCode === 204) {
+        console.log('Server is ready');
+        process.exit(0);
+      } else {
+        console.log(`Unexpected response: ${res.statusCode}`);
+      }
+      resolve();
+    });
+
+    req.on('error', error => {
+      console.error(error);
+      resolve();
+    });
+
+    req.end();
+    attempts++;
+  });
+}
+
+process.exit(1);