Add Check Workflow for PR Testing

[devin-ai-integration]

Add Check Workflow for PR Testing

This PR adds a GitHub Actions workflow that runs tests on pull requests using the pull_request_target event, which is appropriate for open source projects.

Changes

• Added .github/workflows/check.yml to run tests on pull requests
• The workflow validates composer.json, installs dependencies, and runs PHPUnit tests
• Uses pull_request_target event for secure testing of PRs in an open source context

This workflow will help ensure that all PRs maintain code quality by running tests automatically.

Link to Devin run: https://app.devin.ai/sessions/7e5ae8c97d464b8480760363c72c0712
Requested by: Max Prilutskiy ([email protected])

[devin-ai-integration]

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