Add separate rst doctest job

Author: oscarbenjamin

.github/workflows/buildwheel.yml

@@ -75,6 +75,28 @@ jobs:
         with:
           path: dist/*.tar.gz
 
+  test_rst:
+    needs: build_wheels
+    name: Test rst docs
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.12'
+
+      - uses: actions/download-artifact@v3
+        with:
+          name: artifact
+          path: wheelhouse
+
+      - run: pip install --upgrade pip
+      - run: pip install pytest
+      - run: pip install --no-index --find-links wheelhouse python_flint
+      - run: pytest --doctest-glob='*.rst' doc/source
+
   test_wheels:
     needs: build_wheels
     name: Test ${{ matrix.python-version }} wheel on ${{ matrix.os }}
@@ -93,10 +115,8 @@ jobs:
         with:
           name: artifact
           path: wheelhouse
-      - run: pip install pytest
       - run: pip install --no-index --find-links wheelhouse python_flint
       - run: python -m flint.test --verbose
-      - run: pytest --doctest-glob='*.rst' doc/source
 
   test_pip_vcs_sdist:
     name: pip install ${{ matrix.target }} on ${{ matrix.python-version }}