Replace Wasabi with our own object storage

We more and more use object-storage backend to store our "blobs". Since years this service is provided by PaaS provider Wasabi.

Wasabi is not a bad product at all and it offer many nice features:
* Cost effective
* fine graded access control
* DC all over the world
* No egress costs

But we still suffer of the few problems:
* Costs increasing over time (we use it more), currently around 300 USD/month
* Slow download/upload speeds
* No green computing
* No fine grained control of storage consumption (month granularity)
* US based company
* Not super stable

At this stage, I believe it would make sense to assess the possibility of having our own server with Minio to fix all or part of the problems we face.