Make sphinxneeds available as base docker image

[twodrops]

The current docker image is great to be used as a command line tool.

It would be good to have possibility to use the docker image as a base image.

FROM tlwt/sphinxneeds-docker

This is currently not possible in the way how the entry script runAfterBoot.sh is written.
For example, the creation of folders "/project/*" etc.

I guess with some minor changes to this script, it could be made reusable for the above mentioned usecase.

[tlwt]

Could you prepapre the changes as a pull-request? I gladly integratae them into the base image. I dont know when I find the time to do it.

[twodrops]

@tlwt Sure, I can do that. I patched the script for now (see attached) so that I can use tlwt/sphinxneeds-docker as a base and use the modified runAfterBoot.sh script to generate the docs. I will have to invest some time to think on how the same script can be used as a start-up script and as a build script, without duplicating it.

In short, the workflow is to use tlwt/sphinxneeds-docker as a base and override ENTRYPOINT on start-up and use runAfterBoot.sh or build.sh from inside the container to generate docs.

build.sh