Add GitHub workflow for unit tests

Author: xenova

.github/workflows/tests.yml

@@ -0,0 +1,33 @@
+name: Unit tests
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+    types:
+      - opened
+      - reopened
+      - synchronize
+      - ready_for_review
+
+jobs:
+  build:
+    if: github.event.pull_request.draft == false
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [18, 20, 22, 24, latest]
+
+    steps:
+      - uses: actions/checkout@v5
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v6
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm ci
+      - run: npm run build
+      - run: npm run test