feat: add CI workflow with Node.js and Codecov integration

Introduce a CI pipeline that triggers on pushes and pull requests to the main branch and feature branches. This workflow includes building the project, running tests with coverage, and uploading coverage reports to Codecov.

.github/workflows/ci.yml

@@ -0,0 +1,43 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+      - 'feature/*'
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [20] # Test against Node.js 20
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - run: yarn install
+      - run: yarn build
+
+      - name: Run tests with coverage
+        run: yarn test --coverage
+        env:
+          CI: true
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4.0.1
+        with:
+          files: ./coverage/lcov.info
+          flags: unittests
+          name: codecov-umbrella
+          token: ${{ secrets.CODECOV_TOKEN }}