Make CI run cross-platform (#295)

e2e-tests/approve.spec.ts

@@ -1,4 +1,4 @@
-import { test } from "./helpers/test_helper";
+import { test, Timeout } from "./helpers/test_helper";
 import { expect } from "@playwright/test";
 
 test("write to index, approve, check preview", async ({ po }) => {
@@ -11,6 +11,8 @@ test("write to index, approve, check preview", async ({ po }) => {
   await po.snapshotMessages();
 
   // This can be pretty slow because it's waiting for the app to build.
-  await expect(po.getPreviewIframeElement()).toBeVisible({ timeout: 15_000 });
+  await expect(po.getPreviewIframeElement()).toBeVisible({
+    timeout: Timeout.LONG,
+  });
   await po.snapshotPreview();
 });