[CI] Generate Python coverage data for Codecov

.codecov.yml

@@ -7,3 +7,6 @@ coverage:
 comment:
   behavior: once
   require_changes: yes
+
+fixes:
+- "build/python/::interfaces/cython/"

.github/workflows/main.yml

@@ -155,7 +155,7 @@ jobs:
       run: python3 -m pip install -U pip setuptools wheel
     - name: Install Python dependencies
       run: python3 -m pip install ruamel.yaml scons numpy cython h5py pandas scipy pytest
-        pytest-github-actions-annotate-failures gcovr
+        pytest-github-actions-annotate-failures pytest-cov gcovr
     - name: Build Cantera
       run: |
         python3 `which scons` build blas_lapack_libs=lapack,blas coverage=y \
@@ -177,10 +177,10 @@ jobs:
         path: htmlcoverage*
         retention-days: 5
     - name: Upload Coverage to Codecov
-      uses: codecov/codecov-action@v2
+      uses: codecov/codecov-action@v3
       with:
         verbose: true
-        files: ./coverage.xml
+        files: ./coverage.xml,./build/pycov.xml
         fail_ci_if_error: true
 
   example-keywords:

test/python/runCythonTests.py

@@ -89,7 +89,11 @@
     if fast_fail:
         pytest_args.insert(0, "-x")
     if coverage:
-        pytest_args.extend(["--cov=cantera", "--cov-config=test/python/coverage.ini"])
+        pytest_args.extend([
+            "--cov=cantera",
+            "--cov-config=test/python/coverage.ini",
+            "--cov-report=xml:build/pycov.xml"
+        ])
     if verbose:
         pytest_args.insert(0, "-v")
     else: