docs: add GitHub Actions build status badges to README

Author: bobo334

README.md

@@ -2,6 +2,9 @@
 
 一个将 Fitten Code 聊天请求转换为 OpenAI Chat Completions 风格接口的轻量代理服务。
 
+[![Docker Build and Push](https://github.com/bobotechnology/fitten-code-2api/actions/workflows/docker.yml/badge.svg)](https://github.com/bobotechnology/fitten-code-2api/actions/workflows/docker.yml)
+[![Docker Image Version (tag)](https://img.shields.io/docker/v/ghcr.io/bobotechnology/fitten-code-2api/latest?logo=docker&label=ghcr.io)](https://github.com/bobotechnology/fitten-code-2api/pkgs/container/fitten-code-2api)
+
 ## 特性
 
 - 提供 `/v1/models` 和 `/v1/chat/completions` 兼容接口