fix(ci): improve iOS Metro bundler stability and fix devbox-update workflow

[abueide]

Summary

This PR addresses intermittent iOS E2E test failures caused by Metro bundler not reaching a healthy state within the readiness probe timeout, and fixes the broken devbox-update workflow.

Problem Analysis

iOS E2E Test Failures

Symptoms:

• deploy and verify-app steps fail with "Step never executed (process may have been skipped)"
• Metro bundler logs only 5 messages vs 30+ on successful Android runs
• Never reaches "Dev server ready" state

Root Cause:

• Metro bundler sometimes takes longer than 60s to start on iOS runners
• When health checks fail, processes continue running without failing fast
• Dependent steps are skipped due to unmet process_healthy dependency

Evidence:

• ✅ Android E2E: Always passes with Metro reaching healthy state
• ❌ iOS E2E (run #24909229523): Metro fails to start, deploy skipped
• ✅ iOS E2E (run #24971536378 ios-min): Metro starts successfully
• Conclusion: This is an intermittent failure, not a systematic bug

Devbox Update Workflow

Problem: Uses non-existent GitHub Action xiaolutech/devbox-update-action@v1

Error: Unable to resolve action xiaolutech/devbox-update-action@v1, unable to find version v1

Changes

1. Increase iOS Metro Startup Timeouts

File: examples/react-native/tests/test-suite-ios-e2e.yaml

readiness_probe:
  initial_delay_seconds: 10  # Was 5 - give Metro more time before first check
  timeout_seconds: 10        # Was 5 - allow longer per-check timeout  
  failure_threshold: 24      # Was 12 - total timeout now 130s (was 60s)
shutdown:
  signal: 15                 # NEW - graceful termination on failure
  timeout_seconds: 5

Impact: Gives Metro 130s total to reach healthy state (10s initial + 24 checks × 5s)

2. Add Metro Startup Timeout Wrapper

File: plugins/react-native/virtenv/scripts/user/metro.sh

exec timeout 90s npx react-native start --port "$metro_port" --reset-cache

Impact:

• Metro must start within 90s or exit with error code
• Prevents infinite hanging if Metro gets stuck during startup
• Process-compose can detect failure and propagate to dependent steps

3. Improve Health Check Diagnostics

File: plugins/react-native/virtenv/scripts/user/metro.sh

Added detailed error logging to metro_health():

• "environment file not found"
• "METRO_PORT not set"
• "/status endpoint not responding on port X"
• "/index.bundle endpoint not ready for platform X"

Impact: Makes it easier to diagnose why Metro health checks fail

4. Add Fail-Fast Health Check in deploy-ios

File: examples/react-native/tests/test-suite-ios-e2e.yaml

# Verify Metro is healthy before attempting deploy
if ! metro.sh health ios ios; then
  echo "ERROR: Metro bundler is not healthy, cannot deploy" >&2
  exit 1
fi

Impact:

• Fails immediately with clear error if Metro is not ready
• Prevents confusing "Step never executed" messages
• Provides actionable error for debugging

5. Fix Devbox Update Workflow

File: .github/workflows/devbox-update.yml

Replaced broken xiaolutech/devbox-update-action@v1 with:

• Manual devbox update command
• Automatic PR creation using peter-evans/create-pull-request@v7

Impact: Weekly dependency updates will work again

Testing

Manual Testing

• ✅ Verified metro.sh health check error messages locally
• ✅ Confirmed timeout wrapper syntax is correct
• ✅ Validated YAML syntax for test-suite changes

CI Testing

• This PR will run through full E2E test suite
• Watch for iOS E2E tests to complete successfully
• Monitor Metro bundler logs for "Dev server ready" message

Risk Assessment

Low Risk:

• All changes are additive (longer timeouts, better logging)
• No behavior changes to successful paths
• Falls back to existing behavior if new checks pass
• Timeout wrapper uses standard timeout command (available on all runners)

Related Issues

Fixes intermittent iOS E2E test failures observed in:

• Run #24909229523 (PR Fast Checks - Apr 24)
• Run #24971536378 (Full E2E Tests - Apr 27)

Fixes devbox-update workflow failure:

• Run #24990430113 (Devbox Update - Apr 27)

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