ci: add github actions ci workflow

.github/workflows/ci.yaml

@@ -0,0 +1,34 @@
+name: CI
+on: [push]
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Use Node.js 18.x
+        uses: actions/setup-node@v2
+        with:
+          node-version: 18.x
+
+      - name: Cache npm
+        uses: actions/cache@v2
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: ${{ runner.os }}-node-
+
+      - name: Install packages
+        run: npm ci
+
+      - name: Run lint
+        run: npm run lint
+
+      - name: Run tests
+        run: npm run test:cov
+        env:
+          CI: "true"
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v2