Add CI workflow to verify database migrations sequentially

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  push:
+    branches: [main, staging]
+  pull_request:
+    branches: [main]
+
+jobs:
+  migrations:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+
+      - name: Install dependencies
+        run: |
+          cd listener
+          npm ci
+
+      - name: Verify migration order and apply migrations
+        env:
+          DATABASE_PATH: ./data/notifications.db
+        run: |
+          cd listener
+          npm run check-migrations   # fails if pending migrations
+          npm run migrate            # apply all migrations
+
+      - name: Run listener typecheck and tests
+        run: |
+          cd listener
+          npm run typecheck
+          npm test