ci: add codecov

.github/workflows/ci.yml

@@ -125,3 +125,33 @@ jobs:
           path: |
             docs/_build/html
             .pr_number
+
+  upload-test-coverage:
+    runs-on: ubuntu-latest
+    needs:
+      - test
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Download Artifacts
+        uses: actions/download-artifact@v3
+        with:
+          name: coverage-data
+
+      - name: Combine coverage files
+        run: |
+          python -Im pip install coverage covdefaults
+          python -Im coverage combine
+          python -Im coverage xml -i
+
+      - name: Fix coverage file name
+        run: sed -i "s/home\/runner\/work\/litestar\/advanced-alchemy/github\/workspace/g" coverage.xml
+
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          files: coverage.xml
+          token: ${{ secrets.CODECOV_TOKEN }}