build_and_publish.yaml

name: Build and upload to PyPI
on:
  pull_request:
  push:
    branches:
      - 'main'
    tags:
      - 'v*'
  release:
    types:
      - published

jobs:
  build_artifacts:
    name: Build artifacts
    runs-on: ubuntu-latest
    strategy:
      fail-fast: true
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - uses: mamba-org/setup-micromamba@8767fb704bd78032e9392f0386bf46950bdd1194
        with:
          environment-file: environment.yml

      - name: Build
        shell: bash -l {0}
        # It seems as though flit publish expects a .pypirc file as compared to
        # only a token passed as an argument.
        # See https://flit.pypa.io/en/latest/cmdline.html#flit-publish
        run: |
          flit build

      - uses: actions/upload-artifact@v4
        with:
          path: dist/*

  upload_pypi:
    name: Upload to PyPI
    needs: [build_artifacts]
    runs-on: ubuntu-latest
    if: github.event_name == 'release' && github.event.action == 'published'
    steps:
      - uses: actions/download-artifact@v4
        with:
          name: artifact
          path: dist

      - uses: pypa/gh-action-pypi-publish@v1.8.11
        with:
          user: __token__
          password: ${{ secrets.PYPI_TOKEN }}