ci: 修复Windows构建工作流的格式问题并重新组织步骤

.gitea/workflows/docker.yml

@@ -161,7 +161,12 @@ jobs:
         if (Test-Path libcore/bin) {
           Get-ChildItem libcore/bin -ErrorAction SilentlyContinue | Format-Table Name, Length
         }
-        \n\n    - name: Setup Flutter\n      uses: subosito/flutter-action@v2\n      with:\n        flutter-version: '3.24.5'\n        channel: 'stable'
+        
+    - name: Setup Flutter
+      uses: subosito/flutter-action@v2
+      with:
+        flutter-version: '3.24.5'
+        channel: 'stable'
         
     - name: Enable Windows desktop
       run: flutter config --enable-windows-desktop