ci: add github action

.github/workflows/tests.yml

@@ -0,0 +1,19 @@
+name: Tests
+
+on:
+  push:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+      - name: Install dependencies
+        run: yarn install
+      - name: Run tests
+        run: yarn jest