feat(ci): add GitHub Actions workflow for automated testing

[sl-cloud]

This commit introduces a comprehensive GitHub Actions CI workflow that automatically runs Laravel tests on every commit and pull request, ensuring code quality and preventing regressions.

• Workflow Configuration:

  • Triggers on push to all branches (*) and pull requests
  • Uses Ubuntu latest with PHP 8.2 matrix strategy
  • Includes all required PHP extensions for Laravel (mbstring, xml, ctype, json, bcmath, pdo_sqlite, sqlite3, curl, zip, gd, intl, fileinfo, openssl, tokenizer)

• Environment Setup:

  • Creates comprehensive .env file with testing defaults
  • Configures SQLite in-memory database (aligned with phpunit.xml)
  • Sets up Laravel-specific environment variables (CACHE_STORE=array, QUEUE_CONNECTION=sync, SESSION_DRIVER=array)
  • Includes AWS SQS queue URLs for testing (tests mock these anyway)

• Performance Optimizations:

  • Caches Composer dependencies using actions/cache@v3
  • Uses optimized Composer installation flags (--no-interaction --prefer-dist --optimize-autoloader)
  • Leverages dependency caching with composer.lock hash-based keys

• Test Execution Pipeline:

  • Generates application key with php artisan key:generate
  • Creates SQLite database file (touch database/database.sqlite)
  • Runs migrations with php artisan migrate --force
  • Executes full test suite with php artisan test (Unit and Feature tests)

• Expected Behavior:

  • Every commit triggers automated testing
  • Results displayed in GitHub Actions tab
  • Pass/fail status indicators on commits and pull requests
  • Prevents merging of failing code

This workflow follows Laravel CI/CD best practices and provides immediate feedback on code quality for all contributors.