coverage: add coverage to CI

Author: maxisbey

.github/workflows/shared.yml

@@ -56,10 +56,13 @@ jobs:
         run: uv sync ${{ matrix.dep-resolution.install-flags }} --all-extras --python ${{ matrix.python-version }}
 
       - name: Run pytest
-        run: uv run ${{ matrix.dep-resolution.install-flags }} --no-sync pytest
+        run: uv run ${{ matrix.dep-resolution.install-flags }} --no-sync coverage run -m pytest
         env:
           UV_RESOLUTION: ${{ matrix.dep-resolution.name == 'lowest-direct' && 'lowest-direct' || 'highest' }}
 
+      - name: Check coverage
+        run: uv run ${{ matrix.dep-resolution.install-flags }} --no-sync coverage report
+
   readme-snippets:
     runs-on: ubuntu-latest
     steps: