added health endpoint (#345)

pages/api/health.ts

@@ -0,0 +1,18 @@
+import { NextApiRequest, NextApiResponse } from 'next';
+
+import packageInfo from '../../package.json';
+
+export default async function handler(req: NextApiRequest, res: NextApiResponse) {
+  try {
+    if (req.method !== 'GET') {
+      throw new Error('Method not allowed');
+    }
+
+    res.status(200).json({
+      version: packageInfo.version,
+    });
+  } catch (err: any) {
+    const { statusCode = 503 } = err;
+    res.status(statusCode).json({});
+  }
+}