Add release workflow for PyPI and GitHub releases

[colesmcintosh]

Summary

• Add automated release workflow triggered by version tags (e.g., v0.2.2) or manual dispatch
• Runs tests before releasing
• Builds and publishes package to PyPI using trusted publishing
• Creates GitHub release with auto-generated release notes

Setup Required

To enable PyPI publishing, configure trusted publishing on PyPI:

1. Go to https://pypi.org/manage/project/langchain-salesforce/settings/publishing/
2. Add a new publisher with:
   • Owner: colesmcintosh
   • Repository: langchain-salesforce
   • Workflow name: release.yml
   • Environment: (leave blank)

Usage

Tag-based release:

git tag v0.2.2
git push origin v0.2.2

Manual release:

• Go to Actions > Release > Run workflow
• Enter the version number

[github-actions]

👋 Welcome to langchain-salesforce!

Thank you for contributing! Your pull request will be automatically checked for:

• ✅ Code formatting (ruff format)
• ✅ Import sorting (ruff)
• ✅ Linting (ruff check)
• ✅ Type checking (mypy)
• ✅ Spelling (codespell)
• ✅ Unit tests (pytest)

🔍 Required Checks

All pull requests must pass the following checks before merging:

• Pull Request Checks workflow must complete successfully
• All required status checks must be green

🧪 Integration Tests

Integration tests will run automatically on pushes to main. For pull requests, add the integration-tests label to trigger them.

🚀 Getting Started

If you need to fix any issues:

1. Format code: make format
2. Check linting: make lint
3. Run tests: make test

The CI checks will update automatically when you push new commits.

📚 Documentation

• Contributing Guidelines
• Development Setup

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