Add CI.

.github/workflows/publish.yml

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+name: Publish wheels and sdist tarball to PyPi
+
+on:
+  push:
+    branches: ['main']
+    tags: ['v?[0-9]+.[0-9]+.[0-9]+']
+  pull_request:
+
+jobs:
+  build_sdist:
+    name: Build source distribution
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: true
+        fetch-depth: 0
+    - name: Set up Python 3.12
+      uses: actions/setup-python@v4
+      with:
+        python-version: 3.12
+    - name: Build a source tarball
+      run: |
+        python -m pip install build
+        python -m build
+    - name: Store sdist as artifact
+      uses: actions/upload-artifact@v3
+      with:
+        name: dist
+        path: dist/*.tar.gz
+
+  test_sdist:
+    name: Test source distribution
+
+    runs-on: ubuntu-latest
+    needs: [build_sdist]
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python 3.12
+      uses: actions/setup-python@v4
+      with:
+        python-version: 3.12
+    - name: Download artifacts produced during the build_wheels and build_sdist jobs
+      uses: actions/download-artifact@v3
+      with:
+        name: dist
+        path: dist/
+    - name: Install system dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y libopenmpi-dev
+    - name: Install package, clean local directory
+      run: |
+        python -m pip install dist/*
+        python -m pip install pytest mock
+        # Remove with Spark 4, 3.* is buggy and requires an undeclared distutils
+        python -m pip install 'setuptools; python_version >= "3.12"'
+    - name: Run tests
+      run: |
+        pytest tests
+
+  build_wheels:
+    name: Build wheels on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: true
+        fetch-depth: 50
+
+    # Used to host cibuildwheel
+    - uses: actions/setup-python@v5
+
+    - name: Install cibuildwheel
+      run: python -m pip install cibuildwheel==2.18.1
+
+    - name: Build wheels
+      run: python -m cibuildwheel --output-dir dist
+      env:
+        CIBW_TEST_COMMAND: "pytest ${{ github.event_name == 'push' && '--run-slow' || '' }} {project}/tests"
+
+    - uses: actions/upload-artifact@v4
+      with:
+        name: cibw-wheels-${{ matrix.os }}-${{ strategy.job-index }}
+        path: ./dist/*.whl
+
+  publish:
+    name: Publish package to PyPI
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
+
+    runs-on: ubuntu-latest
+    needs: [build_wheels, build_sdist, test_sdist]
+
+    environment:
+      name: publish_pypi
+      url: https://pypi.org/p/functionalizer
+
+    permissions:
+      id-token: write  # IMPORTANT: this permission is mandatory for trusted publishing
+
+    steps:
+    - name: Download artifacts produced by the build_sdist job
+      uses: actions/download-artifact@v4
+      with:
+        name: dist
+        path: dist/
+
+    - name: Download artifacts produced by the build_wheels job
+      uses: actions/download-artifact@v4
+      with:
+        pattern: cibw-wheels-*
+        path: dist/
+        merge-multiple: true
+
+    - name: Display structure of downloaded files
+      run: ls -R
+      working-directory: dist
+
+    - name: Publish source distribution package to PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1
+      with:
+        packages_dir: dist/

.github/workflows/test.yml

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+name: Run tests and lint
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.11', '3.12']
+        toxenv: ['py3']
+        include:
+          - python-version: '3.12'
+            toxenv: 'lint'
+          - python-version: '3.12'
+            toxenv: 'coverage'
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: true
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install system dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y libopenmpi-dev
+    - name: Install Python dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install tox
+    - name: Test with tox
+      run: tox -e ${{ matrix.toxenv }}
+    - name: Get coverage
+      if:
+        matrix.toxenv == 'coverage' && github.event_name == 'pull_request'
+      uses: codecov/codecov-action@v4
+      with:
+        fail_ci_if_error: false
+        files: ./coverage.xml
+        flags: pytest
+        name: "functionalizer-py312"