ci: shard API v2 E2E tests into 4 parallel jobs (#26183)

* ci: shard API v2 E2E tests into 4 parallel jobs

Co-Authored-By: anik@cal.com <adhabal2002@gmail.com>

* check

* Fix typo in workflow name from 'Update' to 'Updatee'

* Rename workflow from 'PR Updatee' to 'PR Update'

* update

* test

* update

* fix

* update

* check

* remove

* revert

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/api/v2/jest-e2e.ts

@@ -1,5 +1,22 @@
 import type { Config } from "jest";
 
+// Detect if sharding is being used by checking for --shard flag
+const isSharding = process.argv.some((arg) => arg.includes("--shard"));
+
+// For Jest e2e, we reduce parallelism when sharding in CI to improve test isolation
+// since tests share database state and can interfere with each other
+const getMaxWorkers = () => {
+  if (process.env.CI && isSharding) {
+    // In CI with sharding: reduce workers to improve test isolation
+    // Sharding already provides parallelism across shards (4 parallel jobs)
+    return 4;
+  }
+  // Local development or non-sharded: use more workers (similar to Playwright)
+  return 8;
+};
+
+const maxWorkers = getMaxWorkers();
+
 const config: Config = {
   preset: "ts-jest",
   moduleFileExtensions: ["js", "json", "ts"],
@@ -17,7 +34,7 @@ const config: Config = {
   setupFilesAfterEnv: ["<rootDir>/test/jest.setup-e2e.ts"],
   reporters: ["default", "jest-summarizing-reporter"],
   workerIdleMemoryLimit: "512MB",
-  maxWorkers: 8,
+  maxWorkers,
   testPathIgnorePatterns: ["/dist/", "/node_modules/"],
   transformIgnorePatterns: ["/dist/", "/node_modules/"],
 };