Add Copilot setup workflow for Python-based ComfyUI extension

[Copilot]

This PR adds a GitHub Actions workflow specifically designed for GitHub Copilot's environment setup requirements. The workflow follows the exact specification provided in the issue, adapted for this Python-based ComfyUI extension.

Changes Made

• Created .github/workflows/copilot-setup-steps.yml with the required structure:
  • Job name: copilot-setup-steps (required by Copilot)
  • Minimal permissions: contents: read only
  • Proper triggers: manual dispatch, pushes, and PRs affecting the workflow file

Workflow Features

The workflow is tailored for this project's Python environment:

• Python 3.8 setup - Uses the minimum Python version supported by the project (matching the existing test matrix)
• Dependency installation - Installs pytest and pytest-cov which are the core testing dependencies
• Syntax validation - Validates Python syntax for styles_csv_loader.py and __init__.py to catch basic errors early
• Automatic triggers - Runs when the workflow file changes for easy validation and testing

Validation

All workflow steps have been tested locally and work correctly:

• YAML syntax validation passes
• Python setup and dependency installation works
• Syntax validation catches Python syntax errors
• Workflow structure meets all Copilot requirements

The workflow follows GitHub Actions best practices and uses the same dependency installation pattern as the existing test.yml workflow.

Fixes #31.

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[Copilot]

Pull Request Overview

This PR adds a GitHub Actions workflow specifically designed for GitHub Copilot's environment setup requirements. The workflow follows the exact specification provided in the issue and is tailored for this Python-based ComfyUI extension.

• Adds a new workflow file with required job name copilot-setup-steps and minimal permissions
• Sets up Python 3.8 environment with testing dependencies (pytest, pytest-cov)
• Includes Python syntax validation for core module files