github-actions: add coverage script (#313)

* github-actions: add coverage script

* github-actions: add coverage script

* Update coverage.yml

- Change to only on push. Running coverage on PR is very heavy.
 
- Uploads the report to CodeCov via the shell script for the badge.

Co-authored-by: Vectorized <webby1111@hotmail.com>

.github/workflows/coverage.yml

@@ -0,0 +1,32 @@
+name: Code Coverage
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - 'docs/**'
+      - '**.md'
+
+jobs:
+  run-tests:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [16.x]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Install dependencies
+        run: npm ci
+      - name: Run Coverage and Upload to CodeCov
+        run: |
+          npm run coverage; \
+          curl -Os https://uploader.codecov.io/latest/linux/codecov; \
+          chmod +x codecov; \
+          ./codecov;