Adjust docu generation to not trigger on all container changes

[ndricimrr]

When trying to add new tests to /container the docu generation is being ran each time here.

Docu generation should only be triggered when only the relevant container docu parts are affected.

Figure out which parts/files of /container folder are used for the docu generation part and only trigger docu generation when they are changed. Currently it is triggered on all changes.

Relevant change to be made is most likely here:

luigi/scripts/hooks/generate-docu.sh

Line 9 in 6c2a80f

staged_changes=$(git diff --cached --name-only --diff-filter=ACM | grep -e "core/src/core-api" -e "client/src" -e "container"| wc -l)