B2B-88: add starter kit structure and elements

app/healthcheck/route.ts

@@ -0,0 +1,37 @@
+import { NextResponse } from 'next/server';
+
+import { getSupabaseServerAdminClient } from '@kit/supabase/server-admin-client';
+
+/**
+ * Healthcheck endpoint for the web app. If this endpoint returns a 200, the web app will be considered healthy.
+ * If this endpoint returns a 500, the web app will be considered unhealthy.
+ * This endpoint can be used by Docker to determine if the web app is healthy and should be restarted.
+ */
+export async function GET() {
+  const isDbHealthy = await getSupabaseHealthCheck();
+
+  return NextResponse.json({
+    services: {
+      database: isDbHealthy,
+      // add other services here
+    },
+  });
+}
+
+/**
+ * Quick check to see if the database is healthy by querying the config table
+ * @returns true if the database is healthy, false otherwise
+ */
+async function getSupabaseHealthCheck() {
+  try {
+    const client = getSupabaseServerAdminClient();
+
+    const { error } = await client.rpc('is_set', {
+      field_name: 'billing_provider',
+    });
+
+    return !error;
+  } catch {
+    return false;
+  }
+}