fix: 使用 Alpine 容器镜像解决 checkout action 找不到 node 的问题

.gitea/workflows/backend-ci.yml

@@ -9,10 +9,14 @@ on:
 jobs:
   ci:
     runs-on: aliyun
+    container: golang:1.23-alpine
     defaults:
       run:
         working-directory: backend
     steps:
+      - name: Install Node.js (for checkout action)
+        run: apk add --no-cache nodejs
+
       - uses: "http://8.161.227.145:3000/huanghaosheng/checkout@releases/v4"
 
       - name: Download dependencies