ci: revert to container with Aliyun Alpine mirror

act runner post-step runs in isolated context that can't find node
regardless of symlinks. Revert to container approach but switch to
Aliyun mirror for faster apk downloads (~2min → ~10s).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitea/workflows/deploy.yaml

@@ -8,12 +8,12 @@ on:
 jobs:
   build-and-deploy:
     runs-on: aliyun
+    container: node:22-alpine
     steps:
-      - name: Setup PATH
+      - name: Install tools
         run: |
-          ln -sf /root/.nvm/versions/node/*/bin/node /usr/bin/node
-          ln -sf /root/.nvm/versions/node/*/bin/npm /usr/bin/npm
-          ln -sf /root/.nvm/versions/node/*/bin/npx /usr/bin/npx
+          sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
+          apk add --no-cache docker-cli git
 
       - name: Checkout
         uses: http://47.121.181.112:3000/wonder/checkout@v4