ci: add GitHub Actions to build & check

.github/workflows/actions.yaml

@@ -0,0 +1,42 @@
+name: GitHub Actions
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version:
+          - 18
+          - 20
+          - 22
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js v${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: npm
+      - run: npm ci
+      - run: npm run build
+      - run: npm run check
+      # - run: npm test
+
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js 22
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+      - run: npm ci
+      - run: npm run check