为docker构建添加FFmpeg依赖 (#1807)

* Test: change dockerfile to install ffmpeg

* Add the ffmpeg to dockerfile (required by edge-tts)

docs/GithubAction+AllCapacityBeta

@@ -36,6 +36,9 @@ RUN python3 -m pip install -r request_llms/requirements_chatglm.txt
 RUN python3 -m pip install -r request_llms/requirements_newbing.txt
 RUN python3 -m pip install nougat-ocr
 
+# edge-tts需要的依赖
+RUN apt update && apt install ffmpeg -y
+
 # 预热Tiktoken模块
 RUN python3  -c 'from check_proxy import warm_up_modules; warm_up_modules()'