Git magic for the subtree import with drk.de

For the import we used the following commands:

git remote add drk.de git@gitlab.com:drk-intern/drk-de/typo3.git
git fetch drk.de
git read-tree --prefix=DistributionDRKde/ -u drk.de/stable
git commit -m "Imported XXX as a subtree."

For the update the following is needed once

git remote add drk.de git@gitlab.com:drk-intern/drk-de/typo3.git
git fetch drk.de

Each update is then triggered via the following command

git pull -s subtree drk.de stable

See the following stack overflow article for details