ci: 添加 Gitea Actions 示例工作流

- 新增 ci.yaml 文件，定义 Gitea Actions 示例

.gitea/workflows/ci.yaml

@@ -171,12 +171,15 @@ jobs:
       - name: 重启 Docker 容器
         run: |
           echo "♻️ 重启 epic-go 容器..."
-          # 自动安装 docker CLI
+          # 自动安装 docker CLI，优先用国内源
           if command -v docker &> /dev/null; then
             echo "docker 已安装: $(docker --version)"
           elif command -v apt-get &> /dev/null; then
             apt-get update && apt-get install -y docker.io
           elif command -v apk &> /dev/null; then
+            echo "http://mirrors.aliyun.com/alpine/v3.20/main" > /etc/apk/repositories
+            echo "http://mirrors.aliyun.com/alpine/v3.20/community" >> /etc/apk/repositories
+            apk update
             apk add --no-cache docker-cli
           elif command -v yum &> /dev/null; then
             yum install -y docker