add cheetah

Dockerfile

@@ -14,12 +14,12 @@ RUN \
   apt install -y make && \
   apt install -y openssh-client && \
   apt install -y git && \
-  apt install -y python && \
-  apt install -y python-requests && \
-  apt install -y python-pycodestyle && \
-  apt install -y python-yaml && \
-  apt install -y python-pip && \
-  apt install -y python-xmltodict && \
+  apt install -y python3 && \
+  apt install -y python3-requests && \
+  apt install -y python3-pycodestyle && \
+  apt install -y python3-yaml && \
+  apt install -y python3-pip && \
+  apt install -y python3-xmltodict && \
   apt install -y gpg && \
   apt install -y apt-transport-https && \
   apt install -y wget && \
@@ -32,6 +32,9 @@ RUN \
   apt install -y doxygen && \
   apt install -y jq && \
   rm -rf /var/lib/apt/lists/* && \
+  ln -s /usr/bin/python3 /usr/bin/python && \
+  ln -s /usr/bin/pip3 /usr/bin/pip && \
+  pip install Cheetah3 && \
   cd /tmp && \
   wget $RELEASETOOL_URL && \
   unzip GitlabReleaseTool.zip && \