Add CI workflow

Author: eruens

.github/workflows/ci.yml

@@ -0,0 +1,12 @@
+name: CI
+on: [push, pull_request]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with: { node-version: 22 }
+      - run: npm ci
+      - run: npm test --if-present
+      - run: npm run lint --if-present