Add GitHub Actions workflow for egg subpackage

[Copilot]

The egg subpackage lacked CI/CD automation. This adds pytest workflow matching the existing bnf pattern.

Changes

• .github/workflows/egg-pytest.yml: New workflow with three jobs:
  • pytest: Tests on Python 3.11-3.14
  • build: Creates distribution packages on tag push
  • upload: Publishes to PyPI via pypi-egg environment

Key differences from bnf-pytest.yml

• Removed antlr4-tools installation (not a dependency)
• Working directory set to egg
• PyPI target: apyds-egg

No JavaScript workflow needed - egg is Python-only.

Original prompt

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This section details on the original issue you should resolve

<issue_title>需要给egg subpackage补充.github action</issue_title>
<issue_description>可以模仿bnf这个subpackage, 注意egg 这个subpackage只有python包,没有js的.</issue_description>

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

• Fixes 需要给egg subpackage补充.github action #148

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[Copilot]

Pull request overview

This PR adds GitHub Actions CI/CD automation for the egg subpackage, following the established pattern from the bnf subpackage with appropriate modifications for Python-only testing and publishing.

Key Changes:

• Adds automated pytest workflow for Python 3.11-3.14
• Implements build and PyPI publishing on tag pushes
• Correctly removes antlr4-tools dependency (not needed for egg)

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