ci: set up

.github/workflows/ci.yml

@@ -0,0 +1,22 @@
+name: npm test
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node: [18, 20]
+    name: Node ${{ matrix.node }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+      - run: npm ci
+      - run: npm test