Update docs

Author: kamdubiel

apps/frontend-e2e/home.spec.ts-snapshots/reports-screenshots-chromium-home-en-e2e-frontend-darwin.png

@@ -32,8 +32,18 @@ All commands can be run only for a specific package with Turbo filtering, for ex
 - Point `playwright.config.ts` to the shared base: `@infinum/configs/playwright/base`.
 - Reuse helpers from `@infinum/e2e-utils` (fixtures, waits, viewports, reports).
 - Keep snapshots and app-specific page objects inside that E2E app.
+- Give each new Next app a unique prod port when running `next start` (e.g. `-p 3001`) so it doesn’t clash with existing frontend apps.
+- Add `E2E_BASE_URL` for the new `apps/<app>-e2e` package, ideally inline before the command in `package.json`, e.g. `"e2e": "E2E_BASE_URL=http://localhost:3001 playwright test --reporter=html",`
 
 ## Consistency tips
 
 - Generate and validate snapshots in headless for stable rendering; if you must use headed, regenerate and stay consistent.
 - Ensure `E2E_BASE_URL` is set when not using `http://localhost:3000`.
+
+## Testing with Act
+
+Run locally with [GitHub Act](https://github.com/nektos/act) from the repo root; ensure the apps default ports are free before starting.
+
+```sh
+act pull_request -W ./.github/workflows/e2e.yml -j e2e
+```