Fixed #136: Replace release workflow with wheels one

Replaced the release-only release workflow with a new wheels one that serves 2 purposes:
- Build all supported wheels + sdist on every push/PR to ensure publication is not affected
- Additionnaly publish those to PyPI if triggered via a release

Author: rgaudin

.github/workflows/release.yml

@@ -0,0 +1,70 @@
+name: Build and maybe upload to PyPI
+
+on:
+  push:
+  pull_request:
+  release:
+    types:
+      - published
+
+env:
+  # CIBW_ENVIRONMENT: "LIBZIM_DL_VERSION=8.2.0"
+  CIBW_ENVIRONMENT: "LIBZIM_DL_VERSION=2023-04-14"
+
+
+jobs:
+  build_wheels:
+    name: Build wheels on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-20.04, macos-11]  # windows-2019
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        if: runner.os == 'Linux'
+        uses: docker/setup-qemu-action@v2
+        with:
+          platforms: all
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@v2.12.1
+
+      - uses: actions/upload-artifact@v3
+        with:
+          path: ./wheelhouse/*.whl
+
+  build_sdist:
+    name: Build source distribution
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Build sdist
+        run: pipx run build --sdist
+
+      - uses: actions/upload-artifact@v3
+        with:
+          path: dist/*.tar.gz
+
+  upload_pypi:
+    needs: [build_wheels, build_sdist]
+    runs-on: ubuntu-latest
+    if: github.event_name == 'release' && github.event.action == 'published'
+    steps:
+      - uses: actions/download-artifact@v3
+        with:
+          # unpacks default artifact into dist/
+          # if `name: artifact` is omitted, the action will create extra parent dir
+          name: artifact
+          path: dist
+
+      - uses: pypa/gh-action-pypi-publish@v1.5.0
+        with:
+          user: __token__
+          # password: ${{ secrets.PYPI_API_TOKEN }}
+          password: ${{ secrets.PYPI_TEST_API_TOKEN }}
+          # uncomment for test
+          repository_url: https://test.pypi.org/legacy/