添加docker镜像构建说明

star_lock/.docker/.env.example

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+FLUTTER_STORAGE_BASE_URL="https://mirrors.tuna.tsinghua.edu.cn/flutter"
+PUB_HOSTED_URL="https://mirrors.tuna.tsinghua.edu.cn/dart-pub"

star_lock/.docker/.gitignore

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+.env

star_lock/.docker/README.md

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+# docker持续部署
+构建镜像来自：https://github.com/MobileDevOps/flutter-sdk-image/
+
+## 使用方法
+1. 复制.env文件，并编辑其中的代理设置
+```bash
+cp .docker/.env.example .docker/.env
+```
+
+2. 构建命令
+```bash
+cd <path-to-this-repo>
+
+# 构建sky版本APK
+docker run --env-file .docker/.env --rm -it -v .:/home/mobiledevops/app mobiledevops/flutter-sdk-image:3.16.4 \ 
+flutter build apk --release --flavor sky -t lib/main_sky_full.dart
+
+```
+
+3. 构建完成后，APK文件在build/app/outputs/flutter-apk目录下
+
+### 代理设置
+```bash
+docker run --rm -it -v .:/home/mobiledevops/app -e http_proxy=http://
+```
+
+
+## 排除故障
+测试谷歌连接
+```bash
+# flutter以及maven 下载地址是否正常
+curl -i https://storage.googleapis.com/flutter_infra_release/
+```