Enable auth-service/api-gateway on production, build their images in CI

apps/web/app/api/auth/logout/route.ts

@@ -0,0 +1,8 @@
+import { NextResponse } from "next/server";
+import { SESSION_COOKIE } from "../session";
+
+export async function POST() {
+  const response = NextResponse.json({ ok: true });
+  response.cookies.delete(SESSION_COOKIE);
+  return response;
+}