GitLab

* Add docker files

* Improve docker-compose compatibility

* Use Openstack's standard port

* Use package ffmpeg-dev instead of ffmpeg

* improve dockerfile and config

* Add short docker guide

* adhere to previous naming conventions

* document former json comments

* Undo init.sh approach to touching the db file

* Make clear that it's about files on the host system

* add local path specifier
Co-authored-by: Denys Vitali <denys.vitali@swisscom.com>

security: prevent leak of creator information in space responses; ensure home folder id is set when creating space

fix error handling and displaying on membership PUT and DELETE; don't allow to change your own role; require at least one admin