add codecov stats to all PRs (#511)

* checkin codecov stats

* change GH action

* cleanup

Author: joaquim-verges

.github/workflows/tests.yml

@@ -38,6 +38,13 @@ jobs:
         uses: onbjerg/foundry-toolchain@v1
         with:
           version: nightly
+      - name: Run coverage
+        run: |
+          forge coverage --report lcov
       - name: Run tests
         run: |
           forge test
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          files: ./lcov.info,