Update CI with Coveralls

.github/workflows/build.yml

@@ -42,7 +42,41 @@ jobs:
       - name: Test Jest
         run: npm run test
 
+      - name: Upload coverage artifacts
+        uses: actions/upload-artifact@v1
+        if: github.ref == 'refs/heads/master' &&
+            github.repository == 'yoriiis/svg-chunk-webpack-plugin' &&
+            github.event_name != 'pull_request'
+        with:
+          name: coverage
+          path: coverage
+
       - name: Build
         run: |
           npm run build:tsc
           npm run build:example
+
+  deploy-coverage:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    needs: build
+    if: success() &&
+        github.ref == 'refs/heads/master' &&
+        github.repository == 'yoriiis/svg-chunk-webpack-plugin' &&
+        github.event_name != 'pull_request'
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Download coverage artifacts
+        uses: actions/download-artifact@v1
+        with:
+          name: coverage
+
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12.14.0
+
+      - name: Coveralls
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}