use master as ref for PRs

.github/workflows/test.yml

@@ -53,14 +53,7 @@ jobs:
       - name: Run tests
         run: |
           export C_INCLUDE_PATH=$pythonLocation/include/python${{ steps.python-selector.outputs.python-version }}:$C_INCLUDE_PATH
-          pytest --cov-report term-missing:skip-covered scripts/tests/test_bids_validate.py
-
-      - name: Upload test reports and coverage to artifacts before codecov
-        uses: actions/[email protected]
-        with:
-          name: test-reports-before
-          path: |
-            .test_reports/*
+          pytest --cov-report term-missing:skip-covered
 
       - name: Upload coverage reports to Codecov
         uses: codecov/codecov-action@v4
@@ -72,6 +65,7 @@ jobs:
           directory: .test_reports/
           fail_ci_if_error: true
           plugin: pycoverage
+          commit_parent: ${{ github.event.pull_request.base.sha || github.event.before }}
 
       - name: Upload test reports and coverage to artifacts
         uses: actions/[email protected]