v3.2.0

- [Improvement] `images pull` now also pulls vendor images
- [Feature] Add convenient `config printvalue` command
- [Feature] Customize docker registry
- [Feature] Load configuration parameters from the system environment
- [Improvement] Automatic environment re-generation after
re-configuration
- [Improvement] Error and interrupt handling in UI and web UI
- [Bugfix] Fix missing webui env directory