ci: add GitHub action for CI

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - '**'
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  Build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+      - name: Environment details
+        run: pnpm version
+      - name: Install dependencies
+        run: pnpm install
+      - name: Build
+        run: pnpm run build
+      - name: Test
+        run: pnpm run test:unit
+      - name: Upload coverage data
+        uses: actions/upload-artifact@v4
+        with:
+          name: lcov.info
+          path: out/coverage/lcov.info