Add simple API token check route

src/pages/api/check.ts

@@ -0,0 +1,22 @@
+import type {NextApiRequest, NextApiResponse} from 'next';
+import {env} from '@/env/server.mjs';
+
+type StatusData = { status: ResponseStatus };
+
+type ResponseStatus =
+    | 'unauthorized'
+    | 'success';
+
+
+export default async function handler(
+    req: NextApiRequest,
+    res: NextApiResponse<StatusData>
+) {
+    if (req.query.key != env.API_KEY) {
+        // auth failed
+        res.status(401).json({ status: 'unauthorized' });
+        return;
+    }
+
+    res.status(200).json({ status: 'success'});
+}