add doxygen and procps

Dockerfile

@@ -26,6 +26,8 @@ RUN \
   apt-get install -y zip && \
   apt-get install -y vim.tiny && \
   apt-get install -y p7zip-full && \
+  apt-get install -y procps && \
+  apt-get install -y doxygen && \
   rm -rf /var/lib/apt/lists/* && \
   cd /tmp && \
   wget $RELEASETOOL_URL && \