test: write test codes with gh workflow

.github/workflows/test.yml

@@ -0,0 +1,21 @@
+name: CI
+
+on: [push, pull_request, workflow_dispatch]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@v4
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+      - name: Setup node.js 20
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: "pnpm"
+      - name: Install Dependencies
+        run: pnpm i --frozen-lockfile
+      - name: Run tests
+        run: pnpm test