add ci

.github/workflows/ci.yml

@@ -0,0 +1,22 @@
+name: CI
+on: [push]
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout repo
+        uses: actions/checkout@v3
+
+      - name: install node
+        uses: actions/setup-node@v3
+        with:
+          cache: yarn
+          node-version: 18
+
+      - name: install node deps
+        run: yarn install --frozen-lockfile
+
+      - name: test
+        run: yarn test