Add unit test workflow

.github/workflows/unit-tests.yml

@@ -0,0 +1,30 @@
+name: Unit Tests
+
+on:
+  workflow_dispatch:
+    inputs:
+      branch:
+        description: 'Branch name'
+        required: true
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event_name != 'workflow_dispatch' &&  github.ref_name || inputs.branch}}
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test