Enable test workflow

.github/workflows/tests.yml

@@ -0,0 +1,26 @@
+name: Test Package
+
+on: [push]
+
+jobs:
+  test-package:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v2
+
+      - name: Use Node.js 18.x
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18.x
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Run tests
+        run: pnpm test
+        env:
+          CI: true