ci: Add GitHub action for running tests

.github/workflows/test.yaml

@@ -0,0 +1,20 @@
+name: Test
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+    branches: ['main']
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: "yarn"
+      - run: yarn install --frozen-lockfile
+	    - run: yarn test