ci: add test CI

.github/actions/setup-pnpm/action.yml

@@ -0,0 +1,22 @@
+name: "Setup Node and PNPM"
+
+runs:
+  using: "composite"
+  steps:
+    - name: Install pnpm
+      uses: pnpm/action-setup@v4
+      with:
+        run_install: false
+
+    - name: Get pnpm store directory
+      shell: bash
+      run: |
+        echo "STORE_PATH=$(pnpm store path --silent)" >> $GITHUB_ENV
+
+    - uses: actions/cache@v4
+      name: Setup pnpm cache
+      with:
+        path: ${{ env.STORE_PATH }}
+        key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+        restore-keys: |
+          ${{ runner.os }}-pnpm-store-

.github/workflows/CI.yml

@@ -0,0 +1,42 @@
+name: CI
+
+concurrency:
+  group: "${{ github.workflow }} - ${{ github.head_ref || github.ref }}"
+  cancel-in-progress: true
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    name: Test (Node ${{ matrix.node }})
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: true
+      matrix:
+        node: [18, 20, 22]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup PNPM
+        uses: ./.github/actions/setup-pnpm
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+          cache: "pnpm"
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Run test
+        run: pnpm run test