Add continous integration in GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,40 @@
+name: Continuous Integration
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  # Many color libraries just need this to be set to any value, but at least
+  # one distinguishes color depth, where "3" -> "256-bit color".
+  FORCE_COLOR: 3
+
+
+jobs:
+  checks:
+    name: "Check"
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node_version: 22
+          cache: npm
+
+      - name: Install dependencies
+        run: npm clean-install
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Upload coverage
+        uses: codecov/codecov-action@v4