add cahce removal commands

Dockerfile

@@ -2,7 +2,7 @@ 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
+    #Below is apt mirror setup.
 RUN sed -i 's/deb.debian.org/mirrors.ustc.edu.cn/g' /etc/apt/sources.list &&\
     apt update &&\ 
     apt install -y git curl wget build-essential gcc clang g++ make &&\
@@ -11,12 +11,13 @@ RUN sed -i 's/deb.debian.org/mirrors.ustc.edu.cn/g' /etc/apt/sources.list &&\
 
     
 WORKDIR /app
-
-RUN npm install -g @mermaid-js/mermaid-cli &&\
+    #This sets npm mirror url.
+RUN npm config set registry https://registry.npm.taobao.org &&\
+    npm install -g @mermaid-js/mermaid-cli &&\
     git clone https://github.com/geekan/metagpt
 RUN cd metagpt &&\
     mkdir workspace &&\
-    #This sets the pip mirror, you can delete it if you need to.
+    #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 &&\
     python setup.py install
@@ -24,3 +25,4 @@ RUN cd metagpt &&\
 RUN pip cache purge &&\
     apt autoclean
 
+