Refactor CI workflow to remove Node.js setup step and use npm ci for dependency installation

.gitea/workflows/ci.yml

@@ -9,19 +9,14 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    container: node:lts-alpine
     
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: 'lts/*'
-          cache: 'npm'
-
       - name: Install dependencies
-        run: npm install
+        run: npm ci
 
       - name: Run linter
         run: npm run lint