adding python framework dockerfile

ci-scripts/py-image.Dockerfile

+#docker build -t ci-py:test -f py-image.Dockerfile --build-arg NEEDED_GIT_PROXY="http://proxy.eurecom.fr:8080" .
+#docker run -it --name prod-ci-py ci-py:test /bin/bash
+
+FROM ubuntu:18.04
+ARG NEEDED_GIT_PROXY
+
+RUN apt-get update \
+    && apt install git -y
+
+# In some network environments, GIT proxy is required
+RUN /bin/bash -c "if [[ -v NEEDED_GIT_PROXY ]]; then git config --global http.proxy $NEEDED_GIT_PROXY; fi"
+
+RUN apt install python3 -y \
+    && apt install python3-pip -y \
+    #packages required by framework
+    && pip3 install pexpect \
+    && pip3 install pyyaml \
+    #functions required by framework call to subprocess
+    #curl, fromdos, ping, jq
+
+    && apt install curl -y \
+    && apt install tofrodos -y \
+    && apt install iputils-ping -y \
+    && apt install jq -y \
+
+    #clone repo to retrieve python framework files
+    && git clone -b rh_fr1_newjenkins https://gitlab.eurecom.fr/oai/openairinterface5g.git /tmp/CI-PY 
+ 
+ENTRYPOINT /bin/bash