Add Bitrise E2E pipeline skeleton

[kieran-osgood-shopify]

Stack Context

This is Phase 2 of the BrowserStack Maestro E2E stack for Checkout Kit, stacked on the Phase 1 matrix/smoke foundation.

Parent issue: https://github.com/shop/issues-checkout-kit/issues/1096
Epic: https://github.com/shop/issues-checkout-kit/issues/1084

What?

Adds the Bitrise E2E pipeline skeleton without real BrowserStack execution:

• e2e/bitrise.yml with an e2e graph pipeline
• split package/build/run/report workflow shape
• placeholder RN iOS and RN Android artifact workflows
• placeholder matrix-row run fanout workflow
• placeholder aggregate report workflow
• Bitrise Pipeline intermediate file sharing placeholders
• Bitrise setup docs at e2e/BITRISE.md
• Bitrise skeleton tests
• e2e_matrix count helper for E2E_RUN_COUNT
• Bitrise CLI installed by dev up via dev.yml
• Shopify Bitrise compatibility defaults:
  • no activate-build-cache-for-xcode or activate-build-cache-for-gradle add-on steps
  • RBENV_VERSION=system at app env level so Bitrise does not fail on the repo .ruby-version when 3.4.4 is not installed on the stack

Why?

We want the build/test/report topology and matrix fanout model in place before introducing real app artifacts or BrowserStack API calls.

This keeps Phase 2 focused on CI shape, artifact handoff contracts, caching placeholders, Bitrise app setup documentation, local Bitrise config validation, and compatibility with Shopify's Bitrise environment. The Bitrise config lives under e2e/ because it is scoped to the E2E pipeline.

Validation

shadowenv exec -- ruby e2e/test/e2e_matrix_test.rb
shadowenv exec -- ruby e2e/test/bitrise_pipeline_test.rb
shadowenv exec -- ruby e2e/scripts/e2e_matrix validate
shadowenv exec -- ruby e2e/scripts/e2e_matrix count
shadowenv exec -- bitrise validate -c e2e/bitrise.yml

shadowenv exec -- /opt/dev/bin/dev up installed the Bitrise CLI successfully, then failed later during workspace setup because this worktree does not have storefront .env/Swift sample generated config. bitrise version returned 2.39.2 afterwards and bitrise validate -c e2e/bitrise.yml passed.

[kieran-osgood-shopify]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Soft-launch E2E PR checks #364
• Report E2E results to GitHub #363
• Run BrowserStack Maestro from E2E matrix rows #362
• Build React Native iOS E2E IPA artifact #361
• Build React Native Android E2E APK artifact #360
• Add Bitrise E2E pipeline skeleton #357 👈 (View in Graphite)
• Add E2E matrix launch smoke foundation #356
• main

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