Merge branch '5534-add-docker' into 'master'

LICENSE

config/config_custom.php.dist

config/config_defaults.php

config/inc_projects_config.php

config/inc_roles.php

config/inc_user2roles.php.dist

config/lang/de-de.json

config/lang/en-en.json

data/imldeployment/.htkeep

data/imldeployment/build/readme.md

data/imldeployment/data/database/readme.md

data/imldeployment/data/projects/readme.md

data/imldeployment/data/sshkeys/readme.md

data/imldeployment/defaults/readme.md

data/imldeployment/packages/readme.md

docker/.env

docker/containers/web-server/Dockerfile

...containers/web-server/apache/sites-enabled/vhost_app.conf

docker/containers/web-server/php/extra-php-config.ini

docker/docker-compose.yml