add materials parameter to dockerize

[chainsawriot]

Copy them to output_dir/materials and add a COPY directive to copy it to the container.

So that the output_dir can be shared as research compendium.

[schochastics]

In my opinion, this can be closed too now, if you dont have any other features in mind

[chainsawriot]

@schochastics Yes, I am adding tests to this. Will close this with tests.

[schochastics]

always forget the testing :)