Replace Minio with an alternative S3-compatible storage backend.
While working on removing [azure_v1](https://gitlab.com/gitlab-org/container-registry/-/merge_requests/2846) and [s3_v1](https://gitlab.com/gitlab-org/container-registry/-/commit/93e418a56991539dce67520604e2acccad887a65#note_3251426184) drivers, I have run into persistent failure of s3 tests on azure_v1 removal MR:
https://gitlab.com/gitlab-org/container-registry/-/jobs/13931219150
This does not seem to be a flake (>4 retries were consistently failing) and happens only on go1.25, go1.24 variant of the test is OK.
We knew that sooner or later Minio will start to bit-rot as it has been abandoned by its creators. There are multitude of options available that vary in maturity:
https://blog.feld.me/posts/2026/04/i-just-want-simple-s3/
We can either give them a try or remove MinIO storage tests altogether.
issue