fix CI combined coverage

Author: avaldebe

.github/workflows/test.yml

@@ -44,6 +44,8 @@ jobs:
           python-version:  ${{ matrix.python-version }}
           enable-cache: true
       - name: Run tests
+        env:
+          COVERAGE_FILE: .coverage/coverage.${{ matrix.python-version }}
         run: uvx --with tox-uv tox r -e py
       - name: Store coverage files
         uses: actions/upload-artifact@v4

pyproject.toml

@@ -120,7 +120,7 @@ description =
 uv_resolution =
      py39: lowest
 set_env =
-    !report: COVERAGE_FILE=.coverage/coverage.{envname}
+    !report: COVERAGE_FILE={env:COVERAGE_FILE:.coverage/coverage.{envname}}
 commands =
     coverage run -m pytest -ra -q
 dependency_groups =