Push codecoverage on each PR or commit

.github/workflows/dart.yml

@@ -46,4 +46,16 @@ jobs:
       # package:test for this step to succeed. Note that Flutter projects will
       # want to change this to 'flutter test'.
       - name: Run tests
-        run: dart test
+        run: dart test --coverage="coverage"
+
+      - name: Install coverage tools
+        run: dart pub global activate coverage
+
+      - name: Format Coverage
+        run: $HOME/.pub-cache/bin/format_coverage --lcov --in=coverage --out=coverage/coverage.lcov --report-on=lib
+
+      - name: Upload Coverage to CodeCov
+        uses: codecov/codecov-action@v3
+        with:
+          token: ${{secrets.CODECOV_TOKEN}}
+          file: coverage/coverage.lcov