chore(ci): add retry pulls for base images to avoid transient docker hub timeout

.gitea/workflows/deploy.yml

@@ -29,8 +29,29 @@ jobs:
           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
+            local n=1
+            until [ $n -gt $max ]; do
+              echo "尝试拉取 ${image} (${n}/${max})"
+              if docker pull "${image}"; then
+                echo "✅ 拉取成功: ${image}"
+                return 0
+              fi
+              sleep $((n * 5))
+              n=$((n + 1))
+            done
+            echo "❌ 拉取失败: ${image}"
+            return 1
+          }
+
+          pull_with_retry node:20-alpine
+          pull_with_retry python:3.12-slim
+
           echo "📦 构建镜像 ${FULL_IMAGE}"
-          docker build -t "${FULL_IMAGE}" .
+          docker build --pull=false -t "${FULL_IMAGE}" .
           docker tag "${FULL_IMAGE}" "${IMAGE_NAME}:latest"
 
           if command -v k3s >/dev/null 2>&1; then