feat: add healthcheck endpoint

frontend/src/pages/api/health.tsx

@@ -0,0 +1,14 @@
+import axios from "axios";
+import { NextApiRequest, NextApiResponse } from "next";
+import getConfig from "next/config";
+
+const { apiURL } = getConfig().serverRuntimeConfig;
+
+export default async (req: NextApiRequest, res: NextApiResponse) => {
+  const apiStatus = await axios
+    .get(`${apiURL}/api/configs`)
+    .then(() => "OK")
+    .catch(() => "ERROR");
+
+  res.status(apiStatus == "OK" ? 200 : 500).send(apiStatus);
+};