Feature/dockerize redoc cli (#614)

* Docker container to run redoc-cli

* Dockerfile to package the 'redoc-cli' tool as a docker image

* Revert "Dockerfile to package the 'redoc-cli' tool as a docker image"

This reverts commit fec72ac0ea.

* Dockerfile to package the 'redoc-cli' tool as a docker image

* Fixed with help from RomanGotsiy  & xxxcoltxxx

cli/Dockerfile

@@ -0,0 +1,23 @@
+# Package the 'redoc-cli' as a docker image.
+#
+# To build:
+# $ cd <Redoc project directory>
+# $ docker build -t redoc-cli -f cli/Dockerfile .
+#
+# To run:
+# To display the command line options:
+# $ docker run --rm -it redoc-cli --help
+# .. will display the comand line help
+#
+# To turn `swagger.yml` file in the current directory, to html documentation 'redoc-static.html'
+# $  docker run --rm -it  -v $PWD:/data redoc-cli bundle swagger.yml
+
+FROM node:alpine
+
+RUN npm install -g redoc-cli
+
+WORKDIR /data
+EXPOSE 8080
+
+ENTRYPOINT ["redoc-cli"]
+CMD []