Update tests.yml

Author: cthoyt

.github/workflows/tests.yml

@@ -38,8 +38,10 @@ jobs:
           cache-dependency-glob: "pyproject.toml"
           python-version: ${{ matrix.python-version }}
       - name: "Run command"
+        env:
+          TOX_ENV: ${{ matrix.tox-command }}
         run: |
-          uvx --with tox-uv tox -e ${{ matrix.tox-env }}
+          uvx --with tox-uv tox -e "$TOX_ENV"
 
   docs:
     name: Documentation