ensure Sphinx can access the shared object file (#756)

Rye [claims](https://rye.astral.sh/guide/rust/#iterating) that `rye
sync` is sufficient to build the Rust code but that does not appear to
be true. `rye run maturin develop` builds rust and does the equivalent
of `pip install --editable`.

.github/workflows/python-docs.yml

@@ -19,13 +19,16 @@ jobs:
       - uses: ./.github/actions/setup-python
 
       - name: build Python docs
+        working-directory: pyvortex
         run: |
           set -ex
 
-          rye sync
+          rye run maturin develop
+
+          cd docs
           rye run sphinx-build -M html . _build --fail-on-warning --keep-going
-        working-directory: pyvortex/docs
-      - run: |
+      - name: commit python docs to gh-pages-bench
+        run: |
           set -ex
 
           this_sha=$(git rev-parse HEAD)