Add GitHub Actions workflow to run tests on PRs

Co-authored-by: goransle <7478772+goransle@users.noreply.github.com>

Author: Copilot

.github/workflows/test.yml

@@ -0,0 +1,29 @@
+name: Run Tests
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Setup config.json
+        run: echo '{"token":"","port":"90","repo":"highcharts/highcharts"}' > config.json
+
+      - name: Run tests
+        run: npm test