docker: research the possibility to use a data container to avoid building

[ppanero]

To avoid building the assets in a container:

1- Create a new image with the FS and push it, then share that container image with the others.... Is the same that what we are doing but more cumbersome by maintaining two images.

2- Use "data containers" I am still trying to understand it, I am not 100% sure of the difference from above (1).

In any case, users might want to not run invenio-cli containerize, just work in local and ship.