ci: 新增 Docker 发布工作流

.github/workflows/docker-publish.yml

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+name: Manual Docker Build
+
+# 核心配置：仅允许手动触发
+on:
+  workflow_dispatch:
+    inputs:
+      reason:
+        description: '构建原因'
+        required: false
+        default: 'Manual build update'
+
+env:
+  # 请修改为你的 Docker Hub 镜像名称 (格式: 用户名/仓库名)
+  IMAGE_NAME: foxhui/lmarena-imagen-automator
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      # 1. 拉取代码
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      # 2. 设置 QEMU (支持多架构构建，如 ARM64)
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      # 3. 设置 Docker Buildx
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      # 4. 登录 Docker Hub
+      - name: Log into Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      # 5. 生成 Docker 标签
+      # 逻辑：
+      # - 总是打上 'latest' 标签
+      # - 额外打上 'sha-xxxxxxx' (基于当前 commit 的哈希)
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=latest
+            type=sha,format=short
+
+      # 6. 构建并推送
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          # 开启推送
+          push: true
+          # 使用上面生成的标签
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          # 缓存加速
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          # 同时构建 PC (amd64) 和 Mac/树莓派 (arm64) 版本
+          platforms: linux/amd64,linux/arm64