customer/bison/core#13 Move the optional init file to the web directory before calling drush site:init

Implement new option to clean up containers after the event

Move the optional .init_site.json to /tmp/init_site.json in order to keep it available even after truncating current directory

customer/bison/core#3 Improve automation such that L3D does all the initial site setup if the required parameters are available

Forward auth.json into the l3d container in order to let composer use the stored authentication in all projects

#28 Touch the ~/.gitconfig file to make sure it does exist before creating a new container

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