Phase #3: Add GitHub Actions CI workflow

[souhailmerroun]

Summary

• Adds GitHub Actions CI workflow alongside existing CircleCI configuration
• Both CI systems remain active during transition period
• Workflow structure mirrors CircleCI CE tests

What's included

Job	Description
checkout	Initial code checkout with artifact upload
build	Install dependencies, build assets and front packages
test-back-static	PHPStan, PHP-CS-Fixer, container lint
test-back-unit	PHPSpec unit tests
test-back-acceptance	Behat acceptance tests
test-front-static	TypeScript checking, ESLint
test-front-unit	Jest unit tests
test-back-phpunit	PHPUnit integration tests (5 parallel shards)
test-back-migrations	Migration tests
cypress-sanity	Cypress E2E tests
test-back-behat-legacy	Behat legacy tests (10 parallel shards)

Services

The workflow uses GitHub's service containers:

• MySQL 8.0.34 (matching docker-compose upgrade)
• Elasticsearch 8.17.0 (matching docker-compose upgrade)
• Selenium for Behat tests

Job Dependencies

checkout
    └── build
        ├── test-back-static ─────┐
        ├── test-back-unit ───────┤
        ├── test-back-acceptance  │
        ├── test-front-static ────┤
        ├── test-front-unit       │
        ├── test-back-phpunit ────┤
        │   └── test-back-migrations
        ├── cypress-sanity        │
        └── test-back-behat-legacy (requires static & unit)
                                  │
                                  └── pull-request-success

Test plan

• GitHub Actions workflow triggers on PR
• All jobs complete successfully
• Artifacts (screenshots, videos) uploaded on failure
• CircleCI continues to work in parallel

🤖 Generated with Claude Code