fix(ci): write onboarding_step.json to skip Brev first-run wizard

[cjagwani]

Summary

• Add onboarding_step.json to the Brev CLI setup in the E2E workflow
• Without it, brev ls triggers an interactive onboarding tutorial that hangs on the CI runner waiting for stdin

Root Cause

Follow-up to #1639. The credentials file fix restored auth, but brev ls still hangs because the Brev CLI's first-run onboarding wizard blocks on stdin. This file was also removed in 374a847 (#1470).

Evidence

• Stuck run: 24213469934 — "Install Brev CLI" step hangs indefinitely
• Local test with clean HOME + both files: brev ls returns immediately

Test plan

• Merge to main, trigger e2e-brev with TEST_SUITE=full — confirm brev ls passes and tests actually run

Fixes #1638

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Improved CI/workflow configuration to prevent onboarding prompts from interfering with automated authentication checks.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 8c21cd25-f720-4ed2-926f-a2189791d677

📥 Commits

Reviewing files that changed from the base of the PR and between 55ba539 and 503c697.

📒 Files selected for processing (1)

• .github/workflows/e2e-brev.yaml

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📝 Walkthrough

Walkthrough

A GitHub Actions workflow step was added to write ~/.brev/onboarding_step.json with specific configuration values immediately after generating credentials. This prevents Brev's first-run wizard from blocking on stdin during CI authentication checks.

Changes

Cohort / File(s)	Summary
Brev E2E Workflow Configuration .github/workflows/e2e-brev.yaml	Added step to write onboarding state file (~/.brev/onboarding_step.json) to suppress first-run wizard prompt that was blocking CI authentication.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A wizard was blocking the CI lane,
So we wrote a file to ease the pain—
Onboarding state: step 1, shells run true,
No stdin waits, the tests break through! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly and accurately summarizes the main change: writing onboarding_step.json to skip Brev's first-run wizard in CI.
Linked Issues check	✅ Passed	The PR addresses the core requirement from #1638 by writing onboarding_step.json to prevent the Brev first-run wizard from blocking CI, enabling brev ls to succeed.
Out of Scope Changes check	✅ Passed	The change is focused solely on the E2E Brev workflow file with a minimal, targeted fix (2 lines added) directly addressing the blocking wizard issue.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/brev-onboarding-step-json

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