Add docker stack in app repository

.env_default

.gitignore

README.md

docker-compose.override.yml

docker-compose.yml

docker/legacy/Dockerfile

docker/legacy/front.conf

docker/symfony/Dockerfile

docker/symfony/addPhpRepository.sh

docker/symfony/entrypoint.sh

docker/symfony/install_composer.sh

docker/symfony/symfony.conf

docker/symfony/xdebug.ini

tools/git-hooks/pre-commit