Add a [reusable] workflow for building wheels

.github/actions/reusable-build/action.yml

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+name: Reusable action which builds struct2tensor
+
+inputs:
+  python-version:
+    description: 'Python version'
+    required: true
+runs:
+  using: 'composite'
+  steps:
+    - name: Build the package for Python ${{ inputs.python-version }}
+      uses: pypa/[email protected]
+      with:
+        output-dir: dist
+
+    - name: Upload wheel artifact for Python ${{ inputs.python-version }}
+      uses: actions/upload-artifact@v4
+      with:
+        name: struct2tensor-py${{ inputs.python-version }}
+        path: dist/*.whl
+        if-no-files-found: error

.github/workflows/build.yml

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+name: Build struct2tensor wheels
+
+on:
+  pull_request:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11"]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Build package
+        id: build-package
+        uses: ./.github/actions/reusable-build
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: List and check wheels
+        shell: bash
+        run: |
+          pip install twine
+          ls -lh dist/
+          twine check dist/*
+
+  upload_to_pypi:
+    name: Upload to PyPI
+    runs-on: ubuntu-latest
+    if: (github.event_name == 'release' && github.event.action == 'published') || (github.event_name == 'workflow_dispatch')
+    needs: [build]
+    environment:
+      name: pypi
+      url: https://pypi.org/p/struct2tensor/
+    permissions:
+      id-token: write
+      contents: read
+      attestations: write
+    steps:
+      - name: Retrieve wheels
+        uses: actions/download-artifact@v4
+        with:
+          merge-multiple: true
+          path: wheels
+
+      - name: List the build artifacts
+        run: |
+          ls -lAs wheels/
+
+      - name: Generate artifact attestations for wheels
+        uses: actions/attest-build-provenance@v1
+        with:
+          subject-path: "wheels/*"
+
+      - name: Upload to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          packages_dir: wheels/

pyproject.toml

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+[build-system]
+requires = [
+  "setuptools",
+  "wheel",
+]
+
+[tool.cibuildwheel]
+environment = { TF_VERSION="RELEASED_TF_2" }