add test workflow

Author: juliangruber

.github/workflows/test.yml

@@ -0,0 +1,27 @@
+name: Test Observable Dashboard
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    environment: default
+
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v4
+
+    - name: Install Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: 20
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Test project
+      run: npm test