1.clean apt index; 2.use --no-cache-dir instead

Dockerfile

@@ -1,10 +1,10 @@
 # Use a base image with Python3.9 and Nodejs20 slim version
 FROM nikolaik/python-nodejs:python3.9-nodejs20-slim
 
-# Install Debian software needed by MetaGPT
+# Install Debian software needed by MetaGPT and clean up in one RUN command to reduce image size
 RUN apt update &&\
     apt install -y git chromium fonts-ipafont-gothic fonts-wqy-zenhei fonts-thai-tlwg fonts-kacst fonts-freefont-ttf libxss1 --no-install-recommends &&\
-    apt clean
+    apt clean && rm -rf /var/lib/apt/lists/*
 
 # Install Mermaid CLI globally
 ENV CHROME_BIN="/usr/bin/chromium" \
@@ -14,13 +14,11 @@ RUN npm install -g @mermaid-js/mermaid-cli &&\
 
 # Install Python dependencies and install MetaGPT
 COPY . /app/metagpt
-RUN cd /app/metagpt &&\
-    mkdir workspace &&\
-    pip install -r requirements.txt &&\
-    pip cache purge &&\
-    python setup.py install
-
 WORKDIR /app/metagpt
+RUN mkdir workspace &&\
+    pip install --no-cache-dir -r requirements.txt &&\
+    python setup.py install
 
 # Running with an infinite loop using the tail command
 CMD ["sh", "-c", "tail -f /dev/null"]
+