feat: add GitHub CI workflow with multi-version Node.js and cross-platform matrix

Author: Lellansin

.github/workflows/ci.yml

@@ -0,0 +1,47 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+jobs:
+  build-and-test:
+    name: Node ${{ matrix.node-version }} / ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - windows-latest
+          - macos-latest
+        node-version:
+          - "18"
+          - "20"
+          - "22"
+          - "24"
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: TypeCheck + Lint + Format Check
+        run: npm run check
+
+      - name: Bundle
+        run: npm run bundle
+
+      - name: Test
+        run: npm test