Added pip and python to install requirements in docker file

Dockerfile

@@ -1,4 +1,8 @@
 FROM node:lts-alpine3.9
-RUN apk update && apk add --no-cache bash git openssh
+RUN apk update && apk add --no-cache bash git openssh python py-pip
+
+RUN pip install --no-cache-dir -q --upgrade pip
+RUN pip install --no-cache-dir -q django-extensions pyparsing pydot
+
 COPY entrypoint.sh /entrypoint.sh
 ENTRYPOINT ["/entrypoint.sh"]