build: add npm-test action

Author: LastLeaf

.github/workflows/npm-test.yml

@@ -0,0 +1,20 @@
+name: npm-test
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
+      with:
+        node-version: 20.x
+        cache: 'npm'
+    - run: npm ci
+    - run: npm test