Plugin not working in wordpress installed via Docker

I have installed wordpress via Docker. Other things are working fine except for some plugin that can’t generate the output zip. I wanted to generate static HTML site for wordpress but the plugin “Simply Static” looks like it is hanging all the times once the process starts. Do i need to mount additional volume for them to work or is there any other way. And how can i solve for it?

I am running Docker Server Version: 17.09.0-ce on Ubuntu 17.04