fix: 更新定时任务的 cron 表达式为每天执行一次，并调整 Docker 镜像标签格式

.github/workflows/docker-image-dev.yml

@@ -2,8 +2,7 @@ name: Docker Build and Push (Dev)
 
 on:
   schedule:
-    - cron: '*/10 * * * *' # every 10 minutes
+    - cron: '0 0 * * *' # every day at midnight UTC
-  # push:
   #   branches:
   #     - dev
   workflow_dispatch: # 允许手动触发工作流
@@ -147,8 +146,8 @@ jobs:
         with:
           images: ${{ secrets.DOCKERHUB_USERNAME }}/maibot
           tags: |
-            type=ref,event=branch
+            type=raw,value=dev
-            type=sha,prefix=${{ github.ref_name }}-,enable=${{ github.ref_type == 'branch' }}
+            type=schedule,pattern=dev-{{date 'YYMMDD'}}
 
       - name: Create and Push Manifest
         run: |