build: protect a workflow

nedbat · nedbat · commit b10bbd08bc1a · 2026-04-04T16:20:04.000-04:00
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
@@ -57,8 +57,10 @@ jobs:
           python -m pip install .[dev]
 
       - name: "Run tests"
+        env:
+          MATRIX_PY: "${{ matrix.py }}"
         run: |
-          python -m tox -f py3${{ matrix.py }}
+          python -m tox -f py3$MATRIX_PY
 
       - name: "Upload coverage data"
         uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
