Optimize Dockerfile and README

Dockerfile

@@ -1,28 +1,34 @@
+# This Dockerfile is friendly to users in Chinese Mainland :) 
+# For users outside mainland China, feel free to modify or delete them :)
+
+# Use a base image with Python 3.9.17 slim version (Bullseye)
 FROM python:3.9.17-slim-bullseye
 
-#Special gifts for mainland China users :) 
-#Change to your own preferenced mirrors if you wish, just uncomment them is fine too.
-    #Below is apt mirror setup.
+# Install Debian software needed by MetaGPT
 RUN sed -i 's/deb.debian.org/mirrors.ustc.edu.cn/g' /etc/apt/sources.list &&\
-    apt update &&\ 
+    apt update &&\
     apt install -y git curl wget build-essential gcc clang g++ make &&\
     curl -sL https://deb.nodesource.com/setup_19.x | bash - &&\
-    apt install -y nodejs 
+    apt install -y nodejs &&\
+    apt-get clean
 
-    
+# Set the working directory to /app
 WORKDIR /app
-    #This sets npm mirror url.
+
+# Install Mermaid CLI globally and clone the MetaGPT repository
 RUN npm config set registry https://registry.npm.taobao.org &&\
     npm install -g @mermaid-js/mermaid-cli &&\
+    npm cache clean --force &&\
     git clone https://github.com/geekan/metagpt
+
+# Install Python dependencies and install MetaGPT
 RUN cd metagpt &&\
     mkdir workspace &&\
-    #This sets the pip mirror url.
     pip config set global.index-url https://mirrors.aliyun.com/pypi/simple/ &&\
-    pip install -r requirements.txt --no-cache-dir &&\
+    pip install -r requirements.txt &&\
+    pip cache purge &&\
     python setup.py install
 
-RUN pip cache purge &&\
-    apt autoclean
-
+# Running with an infinite loop using the tail command
+CMD ["sh", "-c", "tail -f /dev/null"]