Add build sdist and upload to ci.

.github/workflows/build_wheels.yml

@@ -1,6 +1,6 @@
 name: build wheels
 
-on: [push, pull_request]
+on: [push, pull_request]  # TODO: on release with tags
 
 jobs:
   build_wheels:
@@ -22,4 +22,36 @@ jobs:
 
       - uses: actions/upload-artifact@v3
         with:
-          path: ./wheelhouse/*.whl
+          path: ./wheelhouse/*.whl
+
+  make_sdist:
+    name: Make SDist
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0  # Optional, use if you use setuptools_scm
+        submodules: true  # Optional, use if you have submodules
+
+    - name: Build SDist
+      run: pipx run build --sdist
+
+    - uses: actions/upload-artifact@v3
+      with:
+        path: dist/*.tar.gz
+
+  upload_all:
+    needs: [build_wheels, make_sdist]
+    environment: pypi
+    permissions:
+      id-token: write
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/download-artifact@v3
+      with:
+        name: artifact
+        path: dist
+
+#    - uses: pypa/gh-action-pypi-publish@release/v1
+#      with:
+#        password: ${{ secrets.PYPI_API_TOKEN }}