fix: isolate release browser journey

Refs #863

tests/e2e/test_mobile_offline_issue_release.py

@@ -15,6 +15,8 @@ from pathlib import Path
 
 import pytest
 
+if os.getenv("STACKCHAIN_RUN_RELEASE_E2E") != "1":
+    pytest.skip("release artifact browser journey runs only in its gated CI job", allow_module_level=True)
 pytest.importorskip("playwright.sync_api")
 from playwright.sync_api import Page, expect, sync_playwright