test every commit on github actions.

.github/workflows/test.yml

@@ -0,0 +1,15 @@
+name: test every commit
+on:
+  - push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 18
+      - run: yarn --ignore-engines
+      - run: node build.cjs
+      - run: yarn test