Experiment with a github action for publishing wheels

.github/workflows/build_and_publish_wheels.yaml

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+name: Build Wheels
+
+on:
+  push:
+#    TODO: Turn on when done testing:
+#    branches:
+#      - main
+#    tags:
+#      - 'v*'
+#    TODO: Turn off when done testing:
+    branches:
+      - 'add-c-kzg-4844-dep'
+
+jobs:
+  build-wheels:
+    name: Build wheels on ${{ matrix.os }} for Python ${{ matrix.python-version }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Initialize and update c-kzg-4844 submodule
+        run: |
+          git submodule update --init --recursive c-kzg-4844
+
+      - name: install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install cibuildwheel
+
+      - name: Setup MSYS2 for make on Windows
+        if: runner.os == 'Windows'
+        uses: msys2/setup-msys2@v2
+        with:
+          update: true
+          install: make
+
+      - name: install blst, ckzg, and python bindings
+        run: |
+          make -C ./c-kzg-4844/src blst
+          make -C ./c-kzg-4844/src
+          python -m pip install ./c-kzg-4844/bindings/python
+
+      - name: Build wheels
+        run: python -m cibuildwheel --output-dir wheelhouse
+        env:
+          CIBW_BUILD: cp38-* cp39-* cp310-* cp311-* cp312-*
+          CIBW_SKIP: "*-win32 *-manylinux_i686 *-musllinux_i686"  # Skip all i686 wheels
+          # For macOS, build Universal 2 binaries if needed
+          CIBW_ARCHS_MACOS: "auto universal2"
+          # Update the manylinux image to a more recent version for broader compatibility
+          CIBW_MANYLINUX_X86_64_IMAGE: manylinux2014
+          CIBW_MANYLINUX_I686_IMAGE: manylinux2014
+
+      - uses: actions/upload-artifact@v2
+        with:
+          path: ./wheelhouse/*.whl
+
+  publish-wheels:
+    needs: build-wheels
+    runs-on: ubuntu-latest
+#    TODO: Turn on when done testing
+#    if: startsWith(github.ref, 'refs/tags/')
+    steps:
+      - uses: actions/download-artifact@v2
+        with:
+          name: artifact
+          path: wheelhouse
+
+#      - name: Publish to PyPI
+#        uses: pypa/gh-action-pypi-publish@v1.4.2
+#        with:
+#          user: __token__
+#          password: ${{ secrets.PYPI_API_TOKEN }}
+#          packages_dir: wheelhouse
+
+      - name: Mock Publish to PyPI
+        run: |
+          twine check wheelhouse/*
+          twine upload --skip-existing --verbose --repository-url https://localhost:9999/ wheelhouse/*
+        env:
+          TWINE_USERNAME: dummy
+          TWINE_PASSWORD: dummy
+