ci: add CI workflow for tests and build verification

Co-Authored-By: Niels Swimberghe <3382717+Swimburger@users.noreply.github.com>

Author: devin-ai-integration[bot]

.github/workflows/ci.yml

@@ -0,0 +1,31 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '18'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npx jest --ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Check dist is up to date
+        run: |
+          git diff --exit-code dist/ || (echo "Error: dist/ is out of date. Run 'npm run build' and commit the result." && exit 1)