add github actions

.github/workflows/ci.yml

@@ -0,0 +1,55 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - '**'
+  pull_request:
+    branches:
+      - main
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [windows-latest]
+        node_version: [20]
+      fail-fast: false
+
+    name: 'Build: node-${{ matrix.node_version }}, ${{ matrix.os }}'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+
+      - name: Cache pnpm modules
+        uses: actions/cache@v2
+        with:
+          path: ~/.pnpm-store
+          key: ${{ runner.os }}-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-
+
+      - name: Set node version to ${{ matrix.node_version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node_version }}
+          cache: 'pnpm'
+
+      - name: Init git submodule
+        run: git submodule init && git submodule update
+
+      - name: Install deps
+        run: pnpm install
+
+      - name: Run benchmark
+        run: node index.js
+