[FEATURE] Configure PyPI package publishing

[chaholl]

Feature Summary

Configure automated publishing of the promptpack and promptpack-langchain packages to PyPI on tagged releases.

Background

Currently, the project:

• Has pyproject.toml files configured with hatchling build system for both packages
• Does not publish to PyPI

Users who want to use the libraries must install from git:

pip install "git+https://github.com/AltairaLabs/promptpack-python.git#subdirectory=packages/promptpack"
pip install "git+https://github.com/AltairaLabs/promptpack-python.git#subdirectory=packages/promptpack-langchain"

Publishing to PyPI would allow:

pip install promptpack
pip install promptpack-langchain

Proposed Implementation

1. PyPI Account Setup

• Create PyPI account for AltairaLabs (if not exists)
• Create projects on PyPI: promptpack and promptpack-langchain
• Set up Trusted Publisher (OIDC) for GitHub Actions (preferred over API tokens)

2. GitHub Workflow

Add a publish workflow that:

• Triggers only on version tags (v*)
• Builds both packages using hatchling
• Publishes to PyPI using trusted publishing

name: Publish to PyPI

on:
  push:
    tags: ["v*"]

jobs:
  publish:
    runs-on: ubuntu-latest
    permissions:
      id-token: write  # Required for trusted publishing
    strategy:
      matrix:
        package: [promptpack, promptpack-langchain]
    steps:
      - uses: actions/checkout@v4
      
      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.12"
      
      - name: Install build tools
        run: pip install build
      
      - name: Build package
        run: python -m build packages/${{ matrix.package }}
      
      - name: Publish to PyPI
        uses: pypa/gh-action-pypi-publish@release/v1
        with:
          packages-dir: packages/${{ matrix.package }}/dist/

3. Package Dependencies

Note: promptpack-langchain depends on promptpack. Need to ensure:

• Both packages are published
• Version constraints are properly specified
• Publishing order handles dependencies correctly

Tasks

• Set up PyPI trusted publisher for promptpack
• Set up PyPI trusted publisher for promptpack-langchain
• Add publish workflow to CI
• Test with TestPyPI first
• Create first release tag to trigger publish
• Update README with pip install instructions
• Update omnia-langchain-runtime to use PyPI packages instead of git

References

• PyPI Trusted Publishers
• gh-action-pypi-publish
• Related: [FEATURE] Configure PyPI package publishing omnia-langchain-runtime#1