ci(docker): 简化 Docker 构建工作流

- 改用 `docker` 作为 Buildx driver，移除自定义 BuildKit 镜像配置。
- 删除构建缓存的 `cache-from` 和 `cache-to` 配置，精简镜像构建步骤。

.github/workflows/docker.yml

@@ -106,8 +106,7 @@ jobs:
       - name: Setup Docker Buildx
         uses: docker/setup-buildx-action@v3
         with:
-          driver-opts: |
-            image=ghcr.io/moby/buildkit:buildx-stable-1
+          driver: docker
 
       - name: Login to GHCR
         uses: docker/login-action@v3
@@ -145,9 +144,3 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          cache-from: |
-            type=gha,scope=lanqin-${{ matrix.name }}
-            type=registry,ref=${{ steps.image.outputs.name }}:buildcache
-          cache-to: |
-            type=gha,mode=max,scope=lanqin-${{ matrix.name }},ignore-error=true
-            type=registry,ref=${{ steps.image.outputs.name }}:buildcache,mode=max