Add codecov reporting

.github/workflows/build.yml

@@ -53,3 +53,13 @@ jobs:
       with:
         name: Releasable Installers
         path: artifacts/
+  
+  build-codecov-report:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Codecov
+      uses: codecov/codecov-action@v1.0.6
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }} # not required for public repos
+        name: codecov-umbrella # optional
+        fail_ci_if_error: true # optional (default = false)