Add tests with remote worker using Docker

[Copilot]

This PR adds comprehensive tests for secator's remote worker functionality using Docker containers, as requested in issue #405.

Changes Made

• New Test Suite: Created tests/integration/test_remote_worker.py with 5 test methods:

  • Basic remote task execution with httpx
  • Chain workflows with remote workers
  • Chord workflows with remote workers
  • Worker availability verification
  • Redis broker connectivity tests

• Documentation: Added tests/integration/README.md with comprehensive documentation for all integration tests, including:

  • Instructions for running remote worker tests
  • Prerequisites and setup requirements
  • Environment variables and debugging tips

• CI Integration: Updated .github/workflows/tests.yml to:

  • Install redis addon for remote worker support
  • Run remote worker tests alongside other integration tests

Implementation Details

The tests automatically manage Docker Compose lifecycle to:

1. Spin up Redis (as Celery broker and result backend)
2. Start a secator worker container
3. Execute tasks remotely and verify results
4. Clean up containers after tests complete

The implementation gracefully handles cases where Docker Compose or redis packages are unavailable, skipping tests as appropriate.

Testing

Run the tests locally:

secator test integration --test test_remote_worker

Or run all integration tests:

secator test integration

• Fixes #405

Original prompt

---

This section details on the original issue you should resolve

<issue_title>test: add tests with "remote" worker</issue_title> <issue_description>Add tests with remote worker: the remote worker can be a Docker container.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes freelabz/secator#405

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[Copilot]

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Resumed work and completed the remote worker tests implementation. The tests use Docker Compose to spin up Redis and a secator worker container, then verify remote task execution with various Celery patterns (basic tasks, chains, and chords). Added comprehensive documentation and integrated into CI. Commits: 421a609, c00d8a4, aa94370, 0a84971