Setup codecov in CI workflow

Author: m-Peter

.github/workflows/ci.yml

@@ -22,4 +22,8 @@ jobs:
     - name: Install Flow CLI
       run: bash -ci "$(curl -fsSL https://raw.githubusercontent.com/onflow/flow-cli/master/install.sh)"
     - name: Run tests
-      run: flow test --cover --covercode="contracts" tests/test_*.cdc
+      run: flow test --cover --covercode="contracts" --coverprofile=coverage.lcov --tests/test_*.cdc
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v3
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

.gitignore

@@ -0,0 +1 @@
+coverage.lcov