The 0003 migration from the certificates app of the LMS requires that
the S3-like platform is correctly setup during initialisation. To solve
this issue, we introduce a pre-init hook that is run prior to the LMS
migrations.
This commit introduces many changes:
- a fully functional minio plugin for local installation
- an almost-functional native k8s deployment
- a new way to process configuration, better suited to plugins
There are still many things to do:
- get rid of all the TODOs
- get a fully functional minio plugin for k8s
- add documentation for pluginso
- ...