Added code coverage to testing workflow

Author: kharigardner

.github/workflows/build.yml

@@ -45,4 +45,4 @@ jobs:
       - name: Install package
         run: |
           pip install -e .[docs,tests]
-
+      

.github/workflows/test.yml

@@ -35,3 +35,6 @@ jobs:
       shell: bash
       run: |
         pytest -vs --cov=pycallrail --cov-report term-missing:skip-covered
+
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v3