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 gives us the opportunity to develop new hooks: build-image and remote-image.
This adds the basic feratures that we need for a working plugin system, but there are still many TODOs in the codebase.
