Issue #79: Copy Zebra DOM indexing configuration files

Test plan:
Edit ktd's .env
DEBUG_GIT_REPO_MISC4DEV=yes
DEBUG_GIT_REPO_MISC4DEV_URL=https://gitlab.com/Joubu/koha-misc4dev.git
DEBUG_GIT_REPO_MISC4DEV_BRANCH=issue_79

Switch your Koha branch to a bug that is modifying Zebra's config files
ktd up, notice this new line during the startup
koha-1       | Running [cp -r /kohadevbox/koha/etc/zebradb/marc_defs/* /etc/koha/zebradb/marc_defs/]...

Confirm that Zebra is using those new config files