fix(e2e): reduce staging E2E concurrency to avoid rate limiting

[jacekradko]

Summary

• Limit staging E2E matrix to 3 parallel jobs (was 9 unrestricted)
• Staging instances have stricter FAPI rate limits than production, causing "Too many requests" errors during concurrent sign-in flows
• Tests pass individually but fail when all 9 suites hit the same staging instance simultaneously

Test plan

• Confirmed locally: sign-in tests pass when run alone, fail with "Too many requests" when run concurrently
• Error context from CI confirms rate limiting: Too many requests. Please try again in a bit.

Summary by CodeRabbit

• Chores
  • Optimized staging environment test execution by implementing controlled parallelization limits.

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	Mar 19, 2026 9:16pm

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Latest commit: 8a9db18

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: ASSERTIVE

Plan: Pro

Run ID: 01b476b5-ee95-44be-99f7-04f08e09aa3c

📥 Commits

Reviewing files that changed from the base of the PR and between 6105fc0 and 8a9db18.

📒 Files selected for processing (1)

• .github/workflows/e2e-staging.yml

---

📝 Walkthrough

Walkthrough

The change adds a concurrency constraint to the e2e-staging workflow by setting max-parallel: 3 on the integration-tests job's execution strategy. This limits the number of matrix test cases that can run simultaneously to 3, preventing all test cases from executing in parallel. No modifications were made to test selection logic, environment variables, error handling, or control flow.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix(e2e): reduce staging E2E concurrency to avoid rate limiting' directly and accurately summarizes the main change: reducing concurrency in staging E2E tests to prevent rate limiting issues.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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📝 Coding Plan

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commit: 8a9db18