ci: setup codecov

Author: jjeffcaii

.github/workflows/rust.yml

@@ -23,3 +23,13 @@ jobs:
           wget -O GeoLite2-Country.mmdb https://git.io/GeoLite2-Country.mmdb
       - name: Run tests
         run: cargo test --verbose
+      - name: rust-grcov
+        uses: actions-rs/[email protected]
+      - name: Upload coverage reports to Codecov
+        uses: codecov/[email protected]
+        env:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          slug: jjeffcaii/zerodns
+        with:
+          verbose: true
+          fail_ci_if_error: true