add sphinxcontrib-plot package

Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:11
+FROM debian:11.3
 
 WORKDIR /docs
 
@@ -30,7 +30,8 @@ RUN apt-get update \
         libgbm1 \
 	libasound2 \
 	locales \
-	graphviz
+	graphviz \
+	gnuplot 
 RUN apt-get autoremove \
  && apt-get clean \
  && rm /var/cache/apt/archives/*.deb  /root/.cache/ /var/lib/apt/lists/*  -rf 
@@ -42,7 +43,8 @@ RUN pip3 install sphinx \
 	docxbuilder \
 	docxbuilder[math] \
 	sphinxcontrib-bibtex \
-	sphinxcontrib-blockdiag
+	sphinxcontrib-blockdiag \
+	sphinxcontrib-plot 
 RUN pip3 install git+http://gitlab.rd.in.linx/GNU/linuxdoc.git
 RUN npm config set registry https://registry.npm.taobao.org
 RUN cd /usr/local/; npm install  @mermaid-js/mermaid-cli