ci: attempt to fix codecov report

.github/workflows/codecov.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - main
+      - codecov
 
 jobs:
   test:
@@ -13,7 +14,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
         with:
-          fetch-depth: 0
+          fetch-depth: 2
 
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -30,7 +31,7 @@ jobs:
           pip install pytest pytest-cov .
 
       - name: Run tests
-        run: pytest --cov --cov-report=xml
+        run: pytest --cov=./ --cov-report=xml
 
       - name: Upload results to Codecov
         uses: codecov/codecov-action@v5