feat(ci): prefer pulling cloud image from compose, fallback to local build

.gitea/workflows/deploy.yml

@@ -27,9 +27,7 @@ jobs:
 
           NEW_COMMIT_SHA=$(git rev-parse --short HEAD)
           NEW_COMMIT_MSG=$(git log -1 --oneline)
-          FULL_IMAGE="${IMAGE_NAME}:${NEW_COMMIT_SHA}"
 
-          echo "🌐 预拉取基础镜像（带重试，避免网络抖动）..."
           pull_with_retry() {
             local image="$1"
             local max=5
@@ -47,18 +45,33 @@ jobs:
             return 1
           }
 
+          # 优先使用 docker-compose.yml 中配置的云端镜像
+          COMPOSE_IMAGE=$(docker compose config --images | head -n 1 || true)
+
+          if [ -n "${COMPOSE_IMAGE}" ]; then
+            echo "☁️ 检测到 compose 镜像: ${COMPOSE_IMAGE}，优先从云端拉取"
+            pull_with_retry "${COMPOSE_IMAGE}"
+            FULL_IMAGE="${COMPOSE_IMAGE}"
+          else
+            FULL_IMAGE="${IMAGE_NAME}:${NEW_COMMIT_SHA}"
+            echo "ℹ️ compose 未配置 image，回退本地构建模式"
+
+            echo "🌐 预拉取基础镜像（带重试，避免网络抖动）..."
             pull_with_retry node:20-alpine
             pull_with_retry python:3.12-slim
 
             echo "📦 构建镜像 ${FULL_IMAGE}"
             docker build --pull=false -t "${FULL_IMAGE}" .
             docker tag "${FULL_IMAGE}" "${IMAGE_NAME}:latest"
+          fi
 
           if command -v k3s >/dev/null 2>&1; then
             echo "📤 导入镜像到 k3s containerd..."
             docker save "${FULL_IMAGE}" | k3s ctr images import -
+            if docker image inspect "${IMAGE_NAME}:latest" >/dev/null 2>&1; then
               docker save "${IMAGE_NAME}:latest" | k3s ctr images import -
             fi
+          fi
 
           echo "🧱 应用 K8s 基础资源..."
           kubectl apply -f k8s/namespace.yaml