Add code coverage reporting

Author: Codex-

.github/workflows/build.yml

@@ -25,7 +25,10 @@ jobs:
         run: npm run build
       - name: test
         if: ${{ always() }}
-        run: npm run test
+        run: npm run test -- --coverage
+      - name: Codecov
+        if: steps.test.outcome == 'success'
+        uses: codecov/codecov-action@v2
       - name: lint
         if: ${{ always() }}
         run: npm run lint

.github/workflows/release.yml

@@ -32,7 +32,10 @@ jobs:
         run: npm run build
       - name: test
         if: ${{ always() }}
-        run: npm run test
+        run: npm run test -- --coverage
+      - name: Codecov
+        if: steps.test.outcome == 'success'
+        uses: codecov/codecov-action@v2
       - name: lint
         if: ${{ always() }}
         run: npm run lint